¿áTMAP_UNITC UNIT_NAMECQAGEC7DESCRIPTIOCþFOSSILCþRADIOMETRIC’SOURCECCLASSNQUADRANGLECROCK_CLASSCNSACLASSNLABELCNSAMODCQCLASSN JQu Glacial deposits and volcanic and plutonic rocks, undivided Quaternary, Tertiary to Jurrassic Glacial deposits and volcanic and plutonic rocks, undivided KN007705 Kenai Igneous 99 99 bu Possible bedrock of unknown character Unknown Areas that air photo interpretation suggest as being underlain by bedrock. Typically are of higher elevation than surrounding glacial deposits and show hints of structure. In one case, an apparent strike and dip of bedding is perceptible on air photos. KN008899 Kenai Sedimentary 99 99 bu Bedrock, undivided Quaternary, Tertiary to Jurrassic Bedrock, undivided KN00799 Kenai 99 99 Qs Surficial deposits Holocene and Pleistocene Surficial deposits SV00282 Seldovia Unconsolidated100 1000 Qs Surficial deposits Holocene and Pleistocene Surficial deposits KN002100 Kenai Unconsolidated100 1000 Qs Surficial deposits Holocene and Pleistocene Surficial deposits KN0033100 Kenai Unconsolidated100 1000 Qs Unconsolidated surficial deposits Holocene Undifferentiated boulders, cobbles, gravel, sand, silt, and clay of present streams; angular clasts of talus and locally, landslide deposits; stratified sand, silt, and clay of alluvial fan and flood-plain deposits; well-sorted stratified sand and gravel BS0043 Blying Sound Unconsolidated100 1000 Qs Unconsolidated surficial deposits Holocene Undifferentiated boulders, cobbles, gravel, sand, silt, and clay of present streams; angular clasts of talus and locally, landslide deposits; stratified sand, silt, and clay of alluvial fan and flood-plain deposits; well-sorted stratified sand and gravel SR0043 Seward Unconsolidated100 1000 Qu Surficial deposits, undivided Holocene Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retrea BS002100 Blying Sound Unconsolidated100 1000 Qu Surficial deposits, undivided Holocene Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retrea MI002100 Middleton IslandUnconsolidated100 1000 Qu Surficial deposits, undivided Holocene Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retrea SR002100 Seward Unconsolidated100 1000 none Drift River delta Quaternary, Holocene Drift river delta, no description KN007707 Kenai Unconsolidated100 1000 Qs Quaternary surficial deposits Quaternary Undivided surficial deposits KN009900 Kenai Unconsolidated100 1000 Qs Surficial deposits, undifferentiated Holocene Surficial deposits, undifferentiated -- Alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. CV003110 Cordova Unconsolidated100 1000 Qu Surficial deposits, undivided Holocene Predominantly alluvium deposited by nonglacial streams and outwash deposited by glacial meltwater. Consists of sand and gravel; terminal, lateral, and ground moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by the retrea CV002100 Cordova Unconsolidated100 1000 yellow Recent glacio-fluvial deposits Quaternary, Holocene glacio-fluvial deposits CV005502 Cordova Unconsolidated100 1000 yellow Recent glacio-fluvial deposits Quaternary, Holocene Glacio-fluvial deposits CV006502 Cordova Unconsolidated100 1000 Qs Undifferentiated surficial deposits Quaternary Mainly unsorted gravel, sand, and silt produced, deposited, and reworked by action of wind, water, glaciers, and frost, including solifluction. In many areas of the map, this unit is a mixture of surrounding surficial deposit units that could not be rea KN008800 Kenai Unconsolidated100 1000 Qcaf Colluvium, alluvium, lacustrine, and floodplain deposits Quaternary, Holocene Colluvium, alluvium, lacustrine, and floodplain deposits SV0051500 Seldovia Unconsolidated100 1000 Qcaf Colluvium, alluvium, lacustrine, and floodplain deposits Quaternary, Holocene Colluvium, alluvium, lacustrine, and floodplain deposits KN0111100 Kenai Unconsolidated100 1000 Qs Quaternary Quaternary Unconsolidated deposits KN0121201 Kenai Unconsolidated100 1000 Q Surficial deposits, undivided Holocene Predominantly glacial moraine and outwash deposits and beach and terrace deposits. Consists of sand and gravel; terminal, lateral, moraine composed of unsorted deposits of boulders, cobbles, gravel, and sand left by retreat of alpine and valley glaciers; SR0053007 Seward Unconsolidated100 1000 Qag Unconsolidated deposits Quaternary Includes stream and beach deposits, glacial till and outwash gravels, colluvium, and landslide debris KN014141 Kenai Unconsolidated100 1000 Qaf Floodplains and alluvial fans, Alluvial fans and alluvial fan complexes Quaternary, Pleistocene Alluvial fans and alluvial fan complexes. Southernmost polygons recoded as Quaternary deposits, undivided. SV0074141 Seldovia Unconsolidated100 1000 Qtf Modern tidal flat and estuarine deposits Quaternary Well-sorted, stratified silt and some sand and local gravel deposited in shallow embayments. Sub-tidal. KN008803 Kenai Unconsolidated103 1030 Qas Tidal silt and beach deposits Quaternary, Holocene Tidal silt and beach deposits KN013401 Kenai Unconsolidated103 1030 Qas Tidal silt and beach deposits Quaternary, Holocene Tidal silt and beach deposits SV007401 Seldovia Unconsolidated103 1030 Qal Alluvial deposits -- Floodplain deposits Quaternary Floodplain deposits, inferred to be largely moderately to well-sorted sand and gravel. Some silt locally. KN006607 Kenai Unconsolidated105 1050 Qal Alluvial deposits, Flood-plain alluvium Quaternary, Recent Flood-plain alluvium, poorly- to well-sorted silt, sand, pebbles, cobbles, and boulders. Mainly cobbles and boudlers except near tidewater. Includes some glacial outwash. KN005500 Kenai Unconsolidated105 1050 Qs Stream-channel deposits Quaternary Stream channel deposits KN007701 Kenai Unconsolidated105 1050 Qal Alluvium Quaternary Mainly gravel and coarse sand, consists in part of glacial and glaciofluvial material reworked by postglacial streams. Forms flood plains along major streams and rivers. KN008805 Kenai Unconsolidated105 1050 Qal Alluvial deposits, Flood-plain alluvium Quaternary, Recent Flood-plain alluvium, poorly- to well-sorted silt, sand, pebbles, cobbles, and boulders. Mainly cobbles and boudlers except near tidewater. Includes some glacial outwash. SV004500 Seldovia Unconsolidated105 1050 Qa Alluvium Holocene In active streambeds and lowest terraces along larger streams and active alluvial fans. Chiefly well sorted gravel and sand; minor silt and boulders CV004703 Cordova Unconsolidated105 1050 Qft Floodplains and alluvial fans Quaternary, Pleistocene Flood plains and associated higher terraces along major streams and abandoned drainage lines KN013413 Kenai Unconsolidated105 1050 Qft Floodplains and alluvial fans Quaternary, Pleistocene Flood plains and associated higher terraces along major streams and abandoned drainage lines SV007413 Seldovia Unconsolidated105 1050 Qaf Floodplains and alluvial fans Quaternary, Pleistocene Alluvial fans and alluvial fan complexes. Northern polygons in Kenai quadrangle recoded as alluvium. KN0134140 Kenai Unconsolidated105 1050 Qaf Alluvial deposits -- Alluvial fans Quaternary Deposits of large flat alluvial fans, inferred to be moderately sorted sand and gravel KN006608 Kenai Unconsolidated106 1060 Qcf Alluvial deposits -- Small alluvial-colluvial fans Quaternary Dposits of small, steep alluvial-colluvial fans, inferred to be non-sorted silt, sand, and gravel KN006609 Kenai Unconsolidated106 1060 Qf Alluvial deposits, Alluvial fans and cones Quaternary, Recent Alluvial fans and cones, unsorted rock talus, in part colluvial in origin. KN005501 Kenai Unconsolidated106 1060 Qfs Alluvial deposits, Partially submerged alluvial fans and cones Quaternary, Recent Partially submerged alluvial fans consisting of sand and gravel; exposed at low tide KN005502 Kenai Unconsolidated106 1063 Qcf? Alluvial deposits -- Small alluvial-colluvial fans Quaternary Dposits of small, steep alluvial-colluvial fans, inferred to be non-sorted silt, sand, and gravel KN006630 Kenai Unconsolidated106 1060 Qf Fan deposits Quaternary Alluvial fan deposits of Cresecent River KN007702 Kenai Unconsolidated106 1060 Qaf Alluvial fan deposits Quaternary Gravel, silt, and sand, commonly occur at mouth of small side canyons. Includes some colluvial deposits. KN008806 Kenai Unconsolidated106 1060 Qf Alluvial deposits, Alluvial fans and cones Quaternary, Recent Alluvial fans and cones, unsorted rock talus, in part colluvial in origin. SV004501 Seldovia Unconsolidated106 1060 Qaf Floodplains and alluvial fans, Alluvial fans and alluvial fan complexes Quaternary, Pleistocene Alluvial fans and alluvial fan complexes KN013414 Kenai Unconsolidated106 1060 Qaf Floodplains and alluvial fans, Alluvial fans and alluvial fan complexes Quaternary, Pleistocene Alluvial fans and alluvial fan complexes SV007414 Seldovia Unconsolidated106 1060 Qct Deposits of Mass Wasting -- talus Quaternary Cone-shaped deposits of talus beneath steep bedrock slopes KN006610 Kenai Unconsolidated107 1071 Qpr Deposits of Mass Wasting -- protalus ramparts Quaternary Deposits of protalus ramparts KN006613 Kenai Unconsolidated107 1071 Qlc Landslide and colluvial deposits Quaternary Unsorted deposits of fine to coarse rubble KN005510 Kenai Unconsolidated107 1070 Qt Talus Quaternary, Holocene Talus-- Boulder- to pebble-sized, angular rock debris. CV003140 Cordova Unconsolidated107 1071 tan Talus Quaternary, Holocene Talus CV005503 Cordova Unconsolidated107 1071 tan Talus Quaternary, Holocene Talus CV006503 Cordova Unconsolidated107 1071 Qc Colluvial deposits Quaternary, Holocene Chiefly rubble, gravel, sand, silt, and clay. Talus and other slope debris deposits, also includes alluvium of minor streams, and locally glacial, rock glacier, and mass-wasting deposits. May include older glacial drift and locally grades into glacial KN008807 Kenai Unconsolidated107 1070 Qlc Landslide and colluvial deposits Quaternary Unsorted deposits of fine to coarse rubble SV004510 Seldovia Unconsolidated107 1070 Qu Slope deposits, undifferentiated Quaternary, Holocene and Pleistocene Colluvium consisting of talus and small landslides, also includes small glacial, rock glacier, and alluvial deposits. Sand, gravel, boulders, diamicton, and rubble CV004701 Cordova Unconsolidated107 1070 Qls Deposits of Mass Wasting -- landslide deposits Quaternary Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading. Assigned NSA = 312 in vicinity of Polly Creek where this unit consists of debris flows from Mount Redoubt. KN006611 Kenai Unconsolidated108 1080 Qcm Deposits of Mass Wasting -- mudflow and debris-flow deposits Quaternary Mudflow and debris flow deposits, may include some volcanic mudflow (lahar) deposits KN006612 Kenai Unconsolidated108 1081 Qls? Deposits of Mass Wasting -- landslide deposits Quaternary Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading KN006626 Kenai Unconsolidated108 1080 Qcm? Deposits of Mass Wasting -- mudflow and debris-flow deposits Quaternary Mudflow and debris flow deposits, may include some volcanic mudflow (lahar) deposits KN006631 Kenai Unconsolidated108 1081 Qls Landslides Quaternary, Holocene Landslides-- Unsorted, angular rock debris derived by failure of bedrock slopes. CV003145 Cordova Unconsolidated108 1080 Qls Landslide deposits Quaternary Chiefly rubble, gravel, sand, silt, and clay. Most extensive in Jurassic sedimentary rock northeast of Mount Iliamna KN008808 Kenai Unconsolidated108 1080 Qra Rock avalanche deposits Quaternary, Holocene Rock avalanche deposits SV0051508 Seldovia Unconsolidated108 1080 Ql Landslide deposits Quaternary, Holocene and Pleistocene Slumps, earth-debris flows, block glides, and debris avalanches. Diamicton and rubble CV004713 Cordova Unconsolidated108 1080 Qls Landslide Quaternary Landslide debris near Bluff Point KN014142 Kenai Unconsolidated108 1080 Qao Older alluvium Quaternary Older alluvial deposits found in larger stream valleys at levels higher than modern alluvium. Grades into terrace deposits KN008809 Kenai Unconsolidated109 1090 Qao Older alluvium Quaternary, Holocene and Pleistocene In higher terraces along larger streams and in inactive alluvial fans. Predominantly of Pleistocene age, but may include localized Holocene deposits. Chiefly well sorted gravel and sand; minor silt and boulders CV004705 Cordova Unconsolidated109 1090 Qtg Terrace deposits Quaternary Terrace gravels in outwash above modern floodplains. Air photo interpretation KN008810 Kenai Unconsolidated110 1100 Symbol Abandoned or underfit stream channel Quaternary? Abandoned or underfit stream channel, inferred to be relict glacial meltwater channel. Shown by symbol on map KN006623 Kenai Unconsolidated111 1110 Qac Abandoned channel deposits Quaternary Abandoned channel deposits in outwash above modern floodplains. Air photo interpretation KN008811 Kenai Unconsolidated111 1110 lt green Recent Lacustrine deposits Quaternary, Holocene Lacustrine deposits CV005501 Cordova Unconsolidated112 1120 lt green Recent Lacustrine deposits Quaternary, Holocene Lacustrine deposits CV006501 Cordova Unconsolidated112 1120 Qfl Fine-grained deposits Quaternary, Holocene In ponds, swamps, lagoons, and along low-gradient streams. Chiefly silt, clay, fine sand, peat, and other organic material CV004707 Cordova Unconsolidated112 1120 Qm Other unconsolidated deposits -- swamp and muskeg Quaternary Swamp and muskeg deposits, mainly organic material, but may include clay, silt, or sand KN006614 Kenai Unconsolidated113 1130 Qsw Swamp deposits Quaternary Silt, sandy silt, and bog deposits, interpreted from air photos KN008813 Kenai Unconsolidated113 1130 Qlv Natural levee deposits Quaternary Natural levee deposits on deltaic or fan delta deposits. KN008814 Kenai Unconsolidated114 1140 Qb Beach deposits Quaternary, Holocene Sand, gravel, and cobbles of present and former beaches, beach ridges, spits, and tidal flats BS0041 Blying Sound Unconsolidated115 1150 Qb Beach deposits Quaternary, Holocene Sand, gravel, and cobbles of present and former beaches, beach ridges, spits, and tidal flats SR0041 Seward Unconsolidated115 1150 Qbv Other unconsolidated deposits -- vegetated beach deposits Quaternary, Holocene Vegetated beach deposits consisting mainly of mixed sand and gravel KN006616 Kenai Unconsolidated115 1151 Qbn Other unconsolidated deposits -- nonvegetated beach deposits Quaternary, Holocene Nonvegetated beach deposits consisting mainly of mixed sand and gravel KN006617 Kenai Unconsolidated115 1150 Qbe Beach deposits, Elevated beach ridges Quaternary, Recent Elevated beach ridges, well-sorted well-stratified, well-drained sand and gravel KN005503 Kenai Unconsolidated115 1151 Qbv? Other unconsolidated deposits -- vegetated beach deposits Quaternary, Holocene Vegetated beach deposits consisting mainly of mixed sand and gravel KN006629 Kenai Unconsolidated115 1151 Qb Beaches, spits, and offshore bars Quaternary, Holocene Beaches, spits, and offshore bars -- Constructional shoreline deposits of well-sorted gravel and sand. CV003115 Cordova Unconsolidated115 1150 Qbe Beach deposits, Elevated beach ridges Quaternary, Recent Elevated beach ridges, well-sorted well-stratified, well-drained sand and gravel SV004503 Seldovia Unconsolidated115 1150 Qb Beach deposits Quaternary, Holocene and Pleistocene Moderately well-stratified and sorted sand and gravel on beaches KN008815 Kenai Unconsolidated115 1150 Qb Beach and delta deposits Quaternary, Holocene Wave-deposited, coarse-grained material and driftwood along seacoast; fine-grained sediment in mud flats of Copper River Delta; and marine uplift terraces. Successive spit-building episodes of progressive gradation are preserved in beach sequences along CV004703 Cordova Unconsolidated115 1150 Qb Beach and delta deposits Quaternary, Holocene Wave-deposited, coarse-grained material and driftwood along seacoast; fine-grained sediment in mud flats of Copper River Delta; and marine uplift terraces. Successive spit-building episodes of progressive gradation are preserved in beach sequences along CV004709 Cordova Unconsolidated115 1150 Qifv Other unconsolidated deposits -- vegetated tidal marsh deposits Quaternary, Holocene Vegetated tidal marsh deposits, consist of organic material mixed with sand and gravel KN006618 Kenai Unconsolidated116 1160 Qifn Other unconsolidated deposits -- nonvegetated tidal marsh deposits Quaternary, Holocene Nonvegetated tidal marsh deposits, consist of organic material mixed with sand and gravel KN006619 Kenai Unconsolidated116 1160 Qida Other unconsolidated deposits -- delta deposits Quaternary, Holocene Delta deposits, representing the intertidal parts of fans and contain coarser material than adjacent tidal flats KN006620 Kenai Unconsolidated116 1160 Qbm Beach deposits, Salt marsh Quaternary, Recent Salt- marsh, well-stratified silt and small pebbles, poorly drained KN005504 Kenai Unconsolidated116 1160 Ql Lagoonal deposits Quaternary, Holocene Lagoonal deposits--Fine-grained silt rich in organic material, mud, and peat. CV003120 Cordova Unconsolidated116 1160 Qes Estuarine deposits Quaternary Well-sorted, stratified silt and some sand deposited in shallow embayments, supra-tidal, hence probably uplifted KN008816 Kenai Unconsolidated116 1160 Qbm Beach deposits, Salt marsh Quaternary, Recent Salt- marsh, well-stratified silt and small pebbles, poorly drained SV004504 Seldovia Unconsolidated116 1160 Qts Elevated tidal silt and beach deposits Quaternary, Pleistocene Elevated tidal silt and beach deposits. Record high sea level stand about 10 - 15 feet above present datum during late Tanya time KN013415 Kenai Unconsolidated116 1160 Qts Elevated tidal silt and beach deposits Quaternary, Pleistocene Elevated tidal silt and beach deposits. Record high sea level stand about 10 - 15 feet above present datum during late Tanya time SV007415 Seldovia Unconsolidated116 1160 Qtm Marine terrace deposits Quaternary, Pleistocene and Holocene Marine terrace deposits KN008817 Kenai Unconsolidated117 1170 Qad Cliff-head dune sand Quaternary, Holocene Cliff-head dune sand. Near Point Possession; of "Alaskan" age KN013402 Kenai Unconsolidated119 1190 Qd Dunes Quaternary, Holocene Dunes-- Well sorted, fine grained sand and silt aligned in longitudinal ridges. CV003125 Cordova Unconsolidated120 1200 Qe Eolian deposits Quaternary, Holocene Dunes on tops of river bluffs, windblown flats, and river bars. Includes informally named Bremner sand dunes, a large barchan field, located at confluence of Bremner and Copper Rivers. Fine-grained sand CV004715 Cordova Unconsolidated120 1200 Qld Hanging delta deposits of Naptowne age Quaternary, Pleistocene Hanging deltaic complexes associated with one or more strandline levels and deposited at mouth of streams draining into proglacial lakes of Naptowne age KN013410 Kenai Unconsolidated123 1230 Qds Glacial deposits -- Proglacial stratified drift Quaternary Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwa KN006603 Kenai Unconsolidated124 1240 Qds? Glacial deposits -- Proglacial stratified drift Quaternary Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwa KN006632 Kenai Unconsolidated124 1240 Qglf Glaciolacustrine deposits Quaternary Ephemeral glacial lake deposits. Well-sorted, well-stratified clay, silt, and fine sand deposited in ephemeral glacial and postglacial lakes. Thought to be typically covered by several feet of muck and peat KN008824 Kenai Unconsolidated124 1240 Qlb Proglacial lake bottom sediments of Naptowne age Quaternary, Pleistocene Proglacial lake bottom sediments underlying terraced and channeled surfaces between major morainal belts in lowland and mountain valleys KN013409 Kenai Unconsolidated124 1240 Qlb Proglacial lake bottom sediments of Naptowne age Quaternary, Pleistocene Proglacial lake bottom sediments underlying terraced and channeled surfaces between major morainal belts in lowland and mountain valleys SV007409 Seldovia Unconsolidated124 1240 Qm Moraine Quaternary Morainal deposits KN003125 Kenai Unconsolidated125 1250 Qd Glacial deposits -- Undifferentiated glacial drift Quaternary Inferred to consist of lodgement till, ablation till, and stratified drift. Thickness ranges widely. KN006600 Kenai Unconsolidated125 1250 Qdt Glacial deposits -- Lateral or terminal moraines Quaternary Till deposits in the form of lateral or terminal moraines KN006601 Kenai Unconsolidated125 1250 Qdi Glacial deposits -- Stratified drift Quaternary Stratified drift in ice-contact deposits (kame terraces or deltas). Identified by high local relief and steeply sloping margins. KN006602 Kenai Unconsolidated125 1250 Qd? Glacial deposits -- Undifferentiated glacial drift Quaternary Inferred to consist of lodgement till, ablation till, and stratified drift. Thickness ranges widely. KN006625 Kenai Unconsolidated125 1250 Qdt? Glacial deposits -- Lateral or terminal moraines Quaternary Till deposits in the form of lateral or terminal moraines KN006624 Kenai Unconsolidated125 1250 Qdi? Glacial deposits -- Stratified drift Quaternary Stratified drift in ice-contact deposits (kame terraces or deltas). Identified by high local relief and steeply sloping margins. KN006627 Kenai Unconsolidated125 1250 lime Older glacial deposits Quaternary, Holocene and Pleistocene Glacial deposits CV006511 Cordova Unconsolidated125 1250 Qd Glacial deposits -- Undifferentiated glacial drift Quaternary Undifferentiated glacial drift KN008825 Kenai Unconsolidated125 1250 Qmi Moraine on ice Quaternary Superglacial and endglacial till on present glaciers KN005508 Kenai Unconsolidated126 1260 Qsm Supraglacial moraine Quaternary, Holocene Supraglacial moraine-- Unweathered, poorly sorted, debris on surfaces of glaciers. CV003130 Cordova Unconsolidated126 1260 Qsg Superglacial drift Quaternary Consists of unsorted boulder to fine-grained debris on the surface of modern glaciers. In the vicinity of Mount Redoubt and Mount Iliamna, may include a significant component of ash and other air-fall debris from eruptions KN008826 Kenai Unconsolidated126 1260 Qmi Moraine on ice Quaternary Superglacial and endglacial till on present glaciers SV004508 Seldovia Unconsolidated126 1260 Qrg Moraine Quaternary Rock glacier deposits KN003127 Kenai Unconsolidated127 1270 Qrg Rock glaciers Quaternary, Holocene Active and recently active rock glaciers. Chiefly rubble and coarse rock debris, interpreted from air photos KN008827 Kenai Unconsolidated127 1270 Qsf Solifluction deposits Quaternary Solifluction mantle, interpreted from airphotos. Thought to be poorly sorted sand, silt, and clay derived from local upslope bedrock sources. KN008828 Kenai Unconsolidated128 1280 Qgtn Glacial deposits, Tunnel Stade Alaskan Glaciation Quaternary Barren moraine as much as 1-mile in front of present glaciers. Tunnel Stade, Alaskan Glaciation KN005505 Kenai Unconsolidated130 1301 Qgt Glacial deposits, Tustumena Stade Alaskan Glaciation Quaternary Partially dissected moraine 1-6-mile in front of present glaciers; spruce and brush covered. Tustumena Stade, Alaskan Glaciation KN005506 Kenai Unconsolidated130 1302 Qm Terminal, lateral, and ground moraine Quaternary, Holocene Terminal, lateral and ground moraine-- Unsorted boulders, cobbles, gravel and sand deposited during retreat of glaciers. CV003135 Cordova Unconsolidated130 1300 tan Glacial deposits, undivided Quaternary, Holocene Glacial deposits CV005504 Cordova Unconsolidated130 1300 tan Younger glacial deposits, undivided Quaternary, Holocene glacial deposits CV006510 Cordova Unconsolidated130 1300 Qag Alaskan glaciation, till, Cirque glaciations Quaternary, Holocene? Unsorted boulder to clay-size particles. Morainal landforms common as are till deposits along the margins of modern glaciers. KN008830 Kenai Unconsolidated130 1301 Qgtn Glacial deposits, Tunnel Stade Alaskan Glaciation Quaternary Barren moraine as much as 1-mile in front of present glaciers. Tunnel Stade, Alaskan Glaciation SV004505 Seldovia Unconsolidated130 1301 Qmh Glacial deposits Quaternary, Holocene Glacial deposits of Holocene age, primarily ice-stagnation drift, outwash, and end moraine KN0111130 Kenai Unconsolidated130 1300 Qmh Glacial deposits Quaternary, Holocene Glacial deposits of holocene age, primarily ice-stagnation drift, outwash, and end moraine SV0051530 Seldovia Unconsolidated130 1300 Qag Drift of Alaskan glaciation Quaternary, Holocene Neoglacial deposits of end, lateral, and ground moraines, kames and outwash proximal to present glaciers; includes small rock glaciers. Diamicton, local gravel, and sand CV004711 Cordova Unconsolidated130 1300 Qgt Glacial deposits, Tustumena Stade Alaskan Glaciation Quaternary Partially dissected moraine 1-6-mile in front of present glaciers; spruce and brush covered. Tustumena Stade, Alaskan Glaciation SV004506 Seldovia Unconsolidated130 1302 Qa Moraines of Alaska Glaciation Quaternary, Holocene Unmodified moraine deposits or mantled by loess, generally 2 to 6 feet thick KN013400 Kenai Unconsolidated130 1300 Qds Glacial deposits -- Proglacial stratified drift (active outwash part) Quaternary Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwa KN006604 Kenai Unconsolidated131 1310 Qdf Glacial deposits -- Outwash fans Quaternary Moderately to heavily vegetated parts of outwash fans KN006605 Kenai Unconsolidated131 1310 Qo Outwash deposits Quaternary Poorly- to well-sorted silt, sand, and gravel in terraces and outwash fans plains KN005509 Kenai Unconsolidated131 1310 Qds? Glacial deposits -- Proglacial stratified drift Quaternary Includes stratified and locally foreset-bedded sand and gravel that occur below 125 m elevation on West Foreland and from Katchin Creek to Redoubt Point; these deposits are probable emerged delta and glaciolacustrine deposits. Also includes active outwa KN006628 Kenai Unconsolidated131 1310 Qao Alaskan Glaciation, outwash Quaternary, Holocene Outwash deposits associated with modern and Holocene glaciers KN008831 Kenai Unconsolidated131 1310 Qo Outwash deposits Quaternary Poorly- to well-sorted silt, sand, and gravel in terraces and outwash fans plains SV004509 Seldovia Unconsolidated131 1310 Qao Outwash and valley train deposits Quaternary, Holocene Graded to moraines of Alaskan age and to existing glacier fronts KN013412 Kenai Unconsolidated131 1310 Qao Outwash and valley train deposits Quaternary, Holocene Graded to moraines of Alaskan age and to existing glacier fronts SV007412 Seldovia Unconsolidated131 1310 Qgn Glacial deposits, Naptowne Glaciation Quaternary Moderately weathered moraine along shoreline; heavily spruce and brush covered; Naptowne Glaciation KN005507 Kenai Unconsolidated135 1353 Qbl Glacial deposits of the Naptowne glaciation Quaternary Loop, recessional, lateral, and medial moraine and other deposits of the Brooks Lake glaciation KN008835 Kenai Unconsolidated135 1353 Qgn Glacial deposits, Naptowne Glaciation Quaternary Moderately weathered moraine along shoreline; heavily spruce and brush covered; Naptowne Glaciation SV004507 Seldovia Unconsolidated135 1353 Qbl Glacial deposits of the Naptowne glaciation - ground moraine? Quaternary Probably ground moraine deposits of the Brooks Lake glaciation KN0088351 Kenai Unconsolidated135 1353 Qn Moraines of Naptowne Glaciation Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess KN013403 Kenai Unconsolidated135 1353 Qw4 Brooks Lake drift, Iliuk Stade Quaternary, Pleistocene Brooks Lake drift, Iliuk Stade KN008836 Kenai Unconsolidated136 1360 Qnt Moraines of Naptowne Glaciation, Tanya advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess KN013404 Kenai Unconsolidated136 1363 Qnt Moraines of Naptowne Glaciation, Tanya advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess SV007404 Seldovia Unconsolidated136 1363 Qbln Brooks Lake, Newhalen moraine Quaternary, Pleistocene End moraine of the Newhalen advance of the Brooks Lake glaciation KN008837 Kenai Unconsolidated137 1370 Qns Moraines of Naptowne Glaciation, Skilak advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess KN013405 Kenai Unconsolidated137 1373 Qns Moraines of Naptowne Glaciation, Skilak advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess SV007405 Seldovia Unconsolidated137 1373 Qblil Brooks Lake, Iliamna moraine Quaternary, Pleistocene End moraine of the Iliamna advance of the Brooks Lake glaciation KN008838 Kenai Unconsolidated138 1380 Qnk Moraines of Naptowne Glaciation, Killey advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess KN013406 Kenai Unconsolidated138 1384 Qntm Moraines of Naptowne Glaciation, terraced moraines Quaternary, Pleistocene Discontinuously mantled below about the 500-ft strandline level with proglacial lake sediments of post Moosehorn, pre-Skilak age. Mantled by various thicknesses of glaciolacustrine deposits KN013408 Kenai Unconsolidated138 1384 Qnk Moraines of Naptowne Glaciation, Killey advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess SV007406 Seldovia Unconsolidated138 1384 Qntm Moraines of Naptowne Glaciation, terraced moraines Quaternary, Pleistocene Discontinuously mantled below about the 500-ft strandline level with proglacial lake sediments of post Moosehorn, pre-Skilak age. Mantled by various thicknesses of glaciolacustrine deposits SV007408 Seldovia Unconsolidated138 1384 Qnm Moraines of Naptowne Glaciation, Moosehorn advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess KN013407 Kenai Unconsolidated139 1393 Qnm Moraines of Naptowne Glaciation, Moosehorn advance Quaternary, Pleistocene Prominent and little modified morainal deposits, mantled by 2 to 6 feet of loess SV007407 Seldovia Unconsolidated139 1393 Qblo Outwash, Brooks Lake glaciation, undivided Quaternary, Pleistocene Outwash, Brooks Lake glaciation, undivided KN008840 Kenai Unconsolidated140 1400 Qno Outwash and valley train deposits Quaternary, Pleistocene Graded to moraines of Naptowne age KN013411 Kenai Unconsolidated140 1400 Qno Outwash and valley train deposits Quaternary, Pleistocene Graded to moraines of Naptowne age SV007411 Seldovia Unconsolidated140 1400 Qdl Deltaic deposits Quaternary Deltaic deposits, including outwash and alluvial deposits. KN008870 Kenai Unconsolidated170 1700 Qdc Glacial deposits -- Pebble- and boulder-bearing diamicton Quaternary Pebble- and boulder-bearing diamicton. Observed at one upland location at West Foreland and in sea cliffs along West Foreland and from Katchin Creek south to near Redoubt Point. KN006606 Kenai Unconsolidated190 1900 Qdc? Glacial deposits -- Pebble- and boulder-bearing diamicton Quaternary Pebble- and boulder-bearing diamicton. Observed at one upland location at West Foreland and in sea cliffs along West Foreland and from Katchin Creek south to near Redoubt Point. KN006633 Kenai Unconsolidated190 1900 Qk Moraines of Knik Glaciation Quaternary, Pleistocene Moraines of Knik Glaciation. Prominent but modified KN013416 Kenai Unconsolidated190 1903 Qe Moraines of Eklutna Glaciation Quaternary, Pleistocene Moraines of Eklutna Glaciation. Subdued and moderately modified KN013419 Kenai Unconsolidated190 1903 Qk Moraines of Knik Glaciation Quaternary, Pleistocene Moraines of Knik Glaciation. Prominent but modified SV007416 Seldovia Unconsolidated190 1903 Qe Moraines of Eklutna Glaciation Quaternary, Pleistocene Moraines of Eklutna Glaciation. Subdued and moderately modified SV007419 Seldovia Unconsolidated190 1903 Qk Moraines of Knik Glaciation Quaternary, Pleistocene Moraines of Knik Glaciation. Prominent but modified SV007416 Seldovia Unconsolidated190 1903 Qkt Terraced moraines of Knik age Quaternary, Pleistocene Terraced moraines of Knik age. Discontinuously manlted below the about 750 foot strandline level KN013417 Kenai Unconsolidated194 1943 Qet Terraced moraines of Eklutna age Quaternary, Pleistocene Terraced moraines of Eklutna age. Discontinuously manlted below the about 1,000 foot strandline level with proglacial lake sediments of Knik and Naptowne age KN013420 Kenai Unconsolidated194 1943 Qkt Terraced moraines of Knik age Quaternary, Pleistocene Terraced moraines of Knik age. Discontinuously manlted below the about 750 foot strandline level SV007417 Seldovia Unconsolidated194 1943 Qet Terraced moraines of Eklutna age Quaternary, Pleistocene Terraced moraines of Eklutna age. Discontinuously manlted below the about 1,000 foot strandline level with proglacial lake sediments of Knik and Naptowne age SV007420 Seldovia Unconsolidated194 1943 Qko Outwash and valley train deposits Quaternary, Pleistocene Outwash and valley train deposits. Graded to moraines of Knik age KN013418 Kenai Unconsolidated195 1953 Qeo Outwash and valley train deposits Quaternary, Pleistocene Outwash and valley train deposits. Graded to moraines of Eklutna age KN013421 Kenai Unconsolidated195 1953 Qko Outwash and valley train deposits Quaternary, Pleistocene Outwash and valley train deposits. Graded to moraines of Knik age SV007418 Seldovia Unconsolidated195 1953 Qeo Outwash and valley train deposits Quaternary, Pleistocene Outwash and valley train deposits. Graded to moraines of Eklutna age SV007421 Seldovia Unconsolidated195 1953 Qc Moraines of Caribou Hills Glaciation Quaternary, Pleistocene Moraines of Caribou Hills Glaciation. Greatly modified KN013422 Kenai Unconsolidated200 2000 Qc Moraines of Caribou Hills Glaciation Quaternary, Pleistocene Moraines of Caribou Hills Glaciation. Greatly modified SV007422 Seldovia Unconsolidated200 2000 Qct Terraced moraines of Caribou Hills age Quaternary, Pleistocene Terraced moraines of Caribou Hills age. Discontinuously mantled below the about 1,000 foot strandline level with proglacial lake sediments of Eklutna?, Knik, and Naptowne age KN013423 Kenai Unconsolidated201 2010 Qsb Scoured bedrock Quaternary Glacially scoured bedrock; may be covered with thin glacially derived deposits; air-photo interpretation. KN008834 Kenai Unconsolidated275 2750 Qf Other unconsolidated deposits -- artificial fill Quaternary, Holocene Artificial fill at Drift River and West Foreland facilities KN006615 Kenai Unconsolidated295 2950 Qv Volcanic rocks, undivided Quaternary Lava flows and associated pyroclastic rocks associated with Iliamna Volcano SV002105 Seldovia Igneous 300 300 Qv Volcanic rocks Quaternary (with mixed Tertiary?) Lava, breccia, and associated pyroclastics. May include Tertiary volcanic rocks KN002300 Kenai Igneous 300 3000 Qv Volcanic rocks of Redoubt Volcano Quaternary Volcanic rocks of Redoubt Volcano KN007704 Kenai Igneous 300 3000 Qv Volcanic rocks, undivided Quaternary Consists of volcanic rocks and deposits associated with Iliamna, Redoubt, and Double Glacier volcanoes. Typically restricted to immediate vicinity of these volcanic centers, however locally, debris flows and air-fall material may be somewhat distal. Lo KN008850 Kenai Igneous 300 3000 Qv Quaternary volcanic rocks Quaternary Volcanic rocks of Iliamna and Redoubt volcanoes KN0121202 Kenai Igneous 300 3000 Qil Iliamna Lava flows Quaternary Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris KN005511 Kenai Igneous 305 3050 Hv Holocene volcanic rocks Quaternary, Holocene Holocene volcanic rocks, primarily associated with Redoubt Volcano KN008855 Kenai Igneous 305 3050 Qil Iliamna Lava flows Quaternary Light-gray hypersthene-augite andesitic lava, breccia, and associated pyroclastic debris SV004511 Seldovia Igneous 305 3050 Qtv Lava flows, North and South Twin volcanic center Quaternary Lava flows from the North and South Twin volcanic center. Probably andesitic SV005555 Seldovia Igneous 305 3050 Qca Ash-rich colluvium Quaternary, Holocene Consists of tephra-rich colluvium in the vicinity of and west of Redoubt volcano. Similar to other volcanoes, these deposits probably consist of ash and larger-sized pyroclasts. On the flank of Redoubt Volcano, these deposits mantle and are incorporate KN008861 Kenai Igneous 311 3110 Qls Deposits of Mass Wasting -- landslide deposits Quaternary Deposits of landslides, including falls, slumps, slides, and failures by lateral spreading. Assigned NSA = 312 in vicinity of Polly Creek where this unit consists of debris flows from Mount Redoubt. KN006635 Kenai Igneous 312 3120 Qm Debris flow deposits Quaternary, Holocene Debris flow deposits of Crescent River valley. Includes several small (older?) deposits in the upper valley and the 3,500-year-old debris flow in the lower valley KN007703 Kenai Igneous 312 3120 Qdf2 Debris flow deposits, older Redoubt flows Quaternary, Holocene Debris flow deposits of North Fork, Crescent River. Deposits of multiple debris flows off the west and southwest flanks Redoubt Volcano. Oldest(?) deposit is derived from west flank of Redoubt. Next oldest deposit appears derived from presently glacia Radiocarbon date of about 3,500 yrs. BP on youngest and most extensive debris flow. KN0088621 Kenai Igneous 312 3121 Qdf1 Debris flow deposits, younger Redoubt flows Quaternary, Holocene Debris flow deposits of North Fork, Crescent River. Deposits of the youngest, most extensive, and probably most fluid debris flow derived from southwest flank of Redoubt Volcano. Flow was apparently derived from a presently glacier free valley draining Radiocarbon date of about 3,500 yrs. BP on youngest and most extensive debris flow. KN0088622 Kenai Igneous 312 3122 Ql Lahar deposits Quaternary, Holocene Lahar deposits KN0111162 Kenai Unconsolidated312 3120 Qdfn Debris flow deposits, younger Redoubt flows Quaternary, Holocene Debris flow deposits on the north flank of Redoubt Volcano in the Drift River valley KN008862 Kenai Igneous 312 3122 none Areas in Drift River valley subjected to flood scour or deposition by 1966 floodsQuaternary, Holocene Areas in Drift River valley subjected to flood scour or deposition by 1966 floods KN007706 Kenai Unconsolidated313 3130 pattern Areas on Drift River delta subjected to flood scour or deposition prior to 1966 Quaternary, Holocene Areas on Drift River delta subjected to flood scour or deposition in the several decades before 1966 KN007708 Kenai Unconsolidated313 3130 Qdr1 Younger Drift River delta mudflow deposits prior to 1957 Quaternary, Holocene Areas of mudflow deposits, tending to be minimally vegetated and relatively close to channel of Drift River KN0088632 Kenai Unconsolidated313 3130 Qdr2 Older Drift River delta mudflow deposits Quaternary, Holocene Areas of mudflow deposits, tending to be more heavily vegetated and tending to control location of Drift River channels KN0088631 Kenai Unconsolidated313 3130 Qdr Drift River delta mudflow deposits, undifferentiated Quaternary, Holocene Areas of mudflow deposits, not easily separatable into the Younger and Older events KN008863 Kenai Unconsolidated313 3130 Qav Volcanic avalanche deposits Quaternary, Holocene Volcanic avalanche deposits consisting of poorly sorted mixture of angular sand, cobbles, and boulders. All deposits contain clasts of gray andesitic lava and yellow-orange hydrothermally altered rocks. Estimated age is less than 1,000 years and some m KN0111164 Kenai Igneous 314 3140 Qv Quaternary volcanic rocks Quaternary, Pleistocene Composite dome complex consisting of medium- to coarsely porphyritic hornblende andesite and dacite. Three K-Ar whole-rock ages, two considered minimum ages at 627 and 763 ka and one of 887 ka. KN009901 Kenai Igneous 402 4020 Ts Sterling Formation Tertiary, Pliocene and Miocene Interbedded, weakly lithified sandstone, siltstone, mudstone, carbonaceous shale, lignite coal, and minor volcanic ash. SV00280 Seldovia Sedimentary 540 Tks Sterling Formation Tertiary, Pliocene and Miocene Sandstone, siltstone, and some coal KN002540 Kenai Sedimentary 540 Tks Sterling Formation Tertiary, Pliocene and Miocene Sandstone, siltstone, and some coal SV010107 Seldovia Sedimentary 540 Tb Beluga Formation Tertiary, Miocene Interbedded, weakly lithified sandstone, siltstone, mudstone, carbonaceous shale, coal, and minor volcanic ash. SV00278 Seldovia Sedimentary 545 Tkb Beluga Formation Miocene Sandstone, siltstone, and coal SV010108 Seldovia Sedimentary 545 Tk Kenai Group Tertiary Coal-bearing semi-consolidated silt, sand, and gravel near Tustumena Glacier. Possibly equivalent to the Sterling Formation? KN0033560 Kenai Sedimentary 560 Tk Kenai Formation Tertiary, Eocene Semiconsolidated coal-bearing silt, sand, and gravel KN013300 Kenai Sedimentary 560 Tk Kenai Formation Tertiary, Eocene Semiconsolidated coal-bearing silt, sand, and gravel SV007300 Seldovia Sedimentary 560 Tk Kenai Formation Tertiary, Eocene Interbedded, poorly consolidated sandstone, siltstone, claystone, and minor amounts of conglomerate. Contains many beds of subbituminouos coal and lignite KN014143 Kenai Sedimentary 560 bT Tertiary bedrock Tertiary Kenai Group and West Foreland Formation; nonmarine sandstone, siltstone, shale, and claystone and local coal KN006621 Kenai Sedimentary 561 bT? Tertiary bedrock Tertiary Kenai Group and West Foreland Formation; nonmarine sandstone, siltstone, shale, and claystone and local coal KN006634 Kenai Sedimentary 561 Q Ty Yakataga Formation Tertiary, Miocene Consists of diverse marine and glaciomarine clastic rocks. Interbedded gray to dark-gray and greenish-gray siltstone, mudstone, and sandstone predominate in the lower part of the formation. Till-like diamictite is interbedded with siltstone in all but mollusks, foraminifers MI002220 Middleton IslandSedimentary 565 QTy Yakataga Formation Quaternary, Pleistocene to Tertiary, Miocene Consists of diverse marine and glaciomarine clastic rocks. Interbedded gray to dark-gray and greenish-gray siltstone, mudstone, and sandstone predominate in lower third of formation. Till-like diamictite dominant rock type in upper part of formation. MI003215 Cordova Sedimentary 565 Tt Tyonek Formation Tertiary, Miocene and Oligocene Conglomerate and subordinate sandstone, siltstone, and coal SV00281 Seldovia Sedimentary 600 Tkt Tyonek Formation Miocene and Oligocene Sandstone, siltstone, coal, and conglomerate SV010106 Seldovia Sedimentary 600 Tkth Tyonek Formation and Hemlock Conglomerate (undivided) Tertiary, Miocene and Oligocene Sandstone, conglomerate, and siltstone KN002630 Kenai Sedimentary 630 2750 Tr Redwood Formation Tertiary, Pliocene to Oligocene? Lower sandstone member: about two-thirds thick-bedded sandstone and one-third silty sandstone and siltstone. Upper member: about one-half siltstone, mudstone and claystone, the rest is conglomerate and sandstone. CV003230 Cordova Sedimentary 675 Tr Redwood Formation Tertiary, Oligocene (?) and Miocene Marine siltstone, sandstone, and conglomerate. The sandstone member consists of about two-thirds thick-bedded sandstone and one-third silty sandstone and siltstone. The characteristic conglomeratic beds show complete gradation from coarse, clast-suppormollusks, and foraminifera CV00230 Cordova Sedimentary 675 Tps Sedimentary rocks, undivided (Poul Creek Formation) Tertiary, Miocene, Oligocene, and Eocene Concretionary pyritic, and glauconitic reddish-weathering, dark-gray to greenish-gray siltstone, claystone, and sandstone with subordinate dark-brown, laminated organic-rich shale, and gray calcareous sandstone; also includes thin interbeds of basaltic tmollusks, and foraminifera MI002235 Middleton IslandSedimentary 680 Tps Poul Creek Formation: Sedimentary rocks, undivided Tertiary, Miocene, Oligocene, and Eocene Concretionary, pyritic, glauconitic, reddish-weathering, dark-gray to greenish-gray siltstone, claystone, and sandstone; shale that is rich in organic material; gray calcareous sandstone; local thin interbeds of basaltic tuff. CV003235 Cordova Sedimentary 680 Tps Poul Creek Formation: Sedimentary rocks, undivided Tertiary, Miocene, Oligocene, and Eocene Concretionary pyritic, and glauconitic reddish-weathering, ark-gray to greenish-gray siltstone, claystone, and sandstone with subordinate dark-brown, laminated organic-rich shale, and gray calcareous sandstone; also includes thin interbeds of basaltic tumollusks, and foraminifera CV00235 Cordova Sedimentary 680 Tps Poul Creek Formation: Sedimentary rocks, undivided Tertiary, Miocene, Oligocene, and Eocene Concretionary, pyritic, glauconitic, reddish-weathering, dark-gray to greenish-gray siltstone, claystone, and sandstone; shale that is rich in organic material; gray calcareous sandstone; local thin interbeds of basaltic tuff. MI003235 Middleton IslandSedimentary 680 Tt Tokun Formation Tertiary, Eocene Consists predominantly of concretionary siltstone and lesser, variable amount of interbedded sandstone. Siltstone is medium to dark gray and nearly massive. Spheroidal calcareous concretions as much as 1 m in maximum dimension are distributed randomly or CV003240 Cordova Sedimentary 810 Tt Tokun Formation Tertiary, Oligocene and Eocene A transgressive marine sequence. Consists predominantly of concretionary siltstone with a lesser and variable amount of interbedded sandstone, chiefly in the lower part of the formation. The siltstone generally is medium to dark gray and nearly massivecrabs, and mollusks CV00240 Cordova Sedimentary 810 Ts Stillwater Formation Tertiary, Eocene Dense hard dark-gray siltstone. Where siltstone is carbonaceous, it has a coalike appearance; where its calcareous, it may be variegated from reddish brown to pale green foraminifers CV003256 Cordova Sedimentary 820 Ts Stillwater Formation Tertiary, Eocene The dominant lithology is dense hard dark-gray siltstone. Where the siltstone is carbonaceous, it has a coaly appearance; where it is calcareous, the siltstone may be variegated in shades of reddish brown to pale green and usually contains foraminifers.foraminifers, and mollusks CV002255 Cordova Sedimentary 820 Twf West Foreland Formation Tertiary, Eocene Poorly sorted polymictic conglomerate, graywacke, and siltstone; having interbedded tuff and local subaerial basalt flows. SV00279 Seldovia Sedimentary 855 Twf West Foreland Formation Tertiary, Eocene and Paleocene Conglomerate, sandstone, and siltstone; mostly tuffaceous KN002855 Kenai Sedimentary 855 2750 Tk Kenai Formation Tertiary, Miocene and Oligocene(?) Tan to light-yellow-brown conglomerate, sandstone, and laminated siltstone; few thin coal beds SV004513 Seldovia Sedimentary 855 Twf? West Foreland Formation Tertiary, Eocene and Paleocene Conglomerate, sandstone, and siltstone; mostly tuffaceous, inferred from air photos, covered by thin glacial deposits KN008820 Kenai Sedimentary 855 Q 2750 Tk Kulthieth Formation Tertiary, Eocene Massive to thin-bedded, coal-bearing, arkosic sandstone, dark-gray to black carbonaceous siltstone and shale, and minor coal. Sandstone and shale ratios in measured sections average about 1:1. Sandstone varies from massive intervals as much as 150 m thplants, and mollusks CV002250 Cordova Sedimentary 860 Tk Kulthieth Formation Tertiary, Eocene Includes at least 1,500 m of interbedded, massive to thin-bedded, coal-bearing arkosic sandstone, dark-gray to black carbonaceous siltstone and shale, and minor coal. Commonly intensely deformed into imbricated stacks of fault-bounded chevron folds. CV003250 Cordova Sedimentary 860 Tos Orca Group -- Sedimentary rocks, undivided Tertiary, Paleocene and early Eocene (?) Dark-gray flysch of thin- to thick-bedded sandstone, pebbly sandstone, siltstone, mudstone, and locally conglomerate and limestone; sandstone is composed chiefly of quartz and plagioclase; conglomerate clasts are mainly felsic porphyry and granite BS00413 Blying Sound Sedimentary 950 Toss Orca Group: Siltstone Tertiary, Paleocene and early Eocene (?) Dark-gray to black siltstone, mudstone, and minor fine-grained sandstone that is tightly folded and metamorphosed to slate; medium-gray and green lenses of micritic limestone as much as 2 m thick present locally in slate; olistostromes of siltstone prese BS00415 Blying Sound Sedimentary 950 Tos Orca Group -- Sedimentary rocks, undivided Tertiary, Paleocene and early Eocene (?) Dark-gray flysch of thin- to thick-bedded sandstone, pebbly sandstone, siltstone, mudstone, and locally conglomerate and limestone; sandstone is composed chiefly of quartz and plagioclase; conglomerate clasts are mainly felsic porphyry and granite SR00413 Seward Sedimentary 950 Toss Orca Group: Siltstone Tertiary, Paleocene and early Eocene (?) Dark-gray to black siltstone, mudstone, and minor fine-grained sandstone that is tightly folded and metamorphosed to slate; medium-gray and green lenses of micritic limestone as much as 2 m thick present locally in slate; olistostromes of siltstone prese SR00415 Seward Sedimentary 950 Tos Orca Group -- Sedimentary rocks, undivided Tertiary, Eocene (?) and Paleocene A sequence of thin- to thick-bedded sandstone, siltstone, and mudstone. Abundant sedimentary structures, such as graded bedding, crossbedding, and ripple marks, along with flute, groove, and load casts, indicate deposition from turbidity currents. SandPollen: Alnus (Alder) Foraminifers: Globogerina sp., G. senni, Globogerina sp. (hispid), Globorotalia sp. Echinoids: Holaster sp. ?Hypsopygaster sp., Nucleopygus BS002271 Blying Sound Sedimentary 950 Tos Orca Group -- Sedimentary rocks, undivided Tertiary, Eocene (?) and Paleocene A sequence of thin- to thick-bedded sandstone, siltstone, and mudstone. Abundant sedimentary structures, such as graded bedding, crossbedding, and ripple marks, along with flute, groove, and load casts, indicate deposition from turbidity currents. SandPollen: Alnus (Alder) Foraminifers: Globogerina sp., G. senni, Globogerina sp. (hispid), Globorotalia sp. Echinoids: Holaster sp. ?Hypsopygaster sp., Nucleopygus SR002271 Seward Sedimentary 950 Tos Orca Group -- Sedimentary rocks, undivided Tertiary, Eocene and Paleocene Very thick, complexly deformed monotonous sequence of thin- to thick-bedded turbidites consisting of sandstone, siltstone, and mudstone; metamorphosed to zeolite or prehnite-pumpellyite facies. Abundant sedimentary features indicate deposition from sedimplanktonic foraminifers, fossil crabs, pelecypods and gastropods CV003271 Cordova Sedimentary 950 Tos Orca Group -- Sedimentary rocks, undivided Tertiary, Eocene (?) and Paleocene A sequence of thin- to thick-bedded sandstone, siltstone, and mudstone. Abundant sedimentary structures, such as graded bedding, crossbedding, and ripple marks, along with flute, groove, and load casts, indicate deposition from turbidity currents. SandPollen: Alnus (Alder), Foraminifers: Globogerina sp., G. senni, Globogerina sp. (hispid), Globorotalia sp., Echinoids: Holaster sp., ?Hypsopygaster sp., Nucleopygus CV00271 Cordova Sedimentary 950 Tosb Orca Group - Massive sandstone (Lithofacies B) Eocene and Paleocene Gray to tan, massive bedded, fine to medium grained sandstone. Beds range in thickness from 2 m to over 5 m. Locally contains interbedded interval of well bedded turbidites of lithofacies C (Mutti and Ricci Lucchi, 1978). Massive sandstone is predominant SR0053086 Seward Sedimentary 950 Tosc Orca Group - "Typical" turbidites Eocene and Paleocene Gray, well bedded, fine to medium grained, alternating layers of sandstone, siltstone, and shale. Beds are in layers less than or equal to 2 m thick. This lithologic association led to the original definition of turbidites (Mutti and Ricci Lucchi, 1978). SR0053093 Seward Sedimentary 950 Tosd Orca Group - Rythmite (sp.) (Lithofacies D) Eocene and Paleocene Dark gray, well bedded, fine grained, siltstone, and shale in beds 5 cm or less in thickness. Probably represents a distal facies of Tosc. Occurs in local map scale outcrops on the southern side of Fairmount Island and the west side of Wells Bay SR0053097 Seward Sedimentary 950 Tosf Orca Group Eocene and Paleocene - Chaotic deposits (Lithofacies F)Dark gray, contorted, fine grained shale. Irregular blocks of rythmite (sp.) and sandstone in a chaotically folded shale host. Probably represent deposition of large slump blocks along submarine canyon walls or the slope environment. The outcrops along t SR0053088 Seward Sedimentary 950 Tosg Orca Group - Shale or argillite (Lithofacies G) Eocene and Paleocene Dark gray, massive argillite or thin bedded shale. Outcrop occurs in a north-trending band north of Eickelberg Bay SR0053033 Seward Sedimentary 950 Tosbd Orca Group - Massive sandstone and rythmite (sp.)(Lithofacies B and D) Eocene and Paleocene Interbedded intervals, undivided at map scale, of tan, massive channel sandstones and rythmite (sp.). Rythmite (sp.) interval probably represents overbank deposits SR0053085 Seward Sedimentary 950 Tops Orca Group: Pillow basalt and sedimentary rocks Tertiary, Paleocene and early Eocene (?) Areas composed of about equal amounts of pillow basalt and interbedded sedimentary rocks of sandstone and subordinate siltstone. Present chiefly on Erlington, Evans, and Bainbridge Islands. Foraminifers. probably Globigerina or Subbotina Probably Tertiary (specimens poorly preserved) BS00419 Blying Sound Igneous 951 Togs Orca Group: Greenstone and sedimentary rocks Tertiary, Paleocene and early Eocene (?) Basalt sills intrude metasedimentary rocks, chiefly slate, on Elrington, Evans, and Bainbridge Islands; basalt sills and dikes in slate and sandstone on Knight Island BS00423 Blying Sound Metamorphic 951 Tops Orca Group: Pillow basalt and sedimentary rocks Tertiary, Paleocene and early Eocene (?) Areas composed of about equal amounts of pillow basalt and interbedded sedimentary rocks of sandstone and subordinate siltstone. Present chiefly on Erlington, Evans, and Bainbridge Islands. Foraminifers. probably Globigerina or Subbotina Probably Tertiary (specimens poorly preserved) SR00419 Seward Igneous 951 Togs Orca Group: Greenstone and sedimentary rocks Tertiary, Paleocene and early Eocene (?) Basalt sills intrude metasedimentary rocks, chiefly slate, on Elrington, Evans, and Bainbridge Islands; basalt sills and dikes in slate and sandstone on Knight Island. Greenstone and sedimentary rocks SR00423 Seward Metamorphic 951 Tosv Orca Group -- Interbedded sedimentary and mafic volcanic rocks Tertiary, Eocene (?) and Paleocene Locally variable amounts of volcanic and sedimentary rocks. In some cases unit is marginal to thicker sequences composed of pillowed and massive basalt flows. The lithologies are quite variable throughout the study area. In Ragged mountains volcaniclaForaminifers: Globigerina or Subbotina; Globigerina sp. (?) Globorotalia sp.; Globigerina cf. G. senni, Globorotalia sp., ?Eoconuloides parvulus, Globigerina sp. (high spired), Globigerina sp. (hispid) BS002332 Blying Sound Sedimentary 951 HFS Tops Orca Group -- Pillow basalt and sedimentary rocks Tertiary, Eocene (?) and Paleocene Pillow basalt, massive basalt flows, minor volcanic breccia interbedded with sandstone, siltstone, and shale. Distinguished from the interbedded sedimentary and mafic volcanic rocks unit on the basis of the predominance of pillow basalt in the section. SR002331 Seward Igneous 951 Tosv Orca Group -- Interbedded sedimentary and mafic volcanic rocks Tertiary, Eocene (?) and Paleocene Locally variable amounts of volcanic and sedimentary rocks. In some cases unit is marginal to thicker sequences composed of pillowed and massive basalt flows. The lithologies are quite variable throughout the study area. In Ragged mountains volcaniclaForaminifers: Globigerina or Subbotina; Globigerina sp. (?) Globorotalia sp.; Globigerina cf. G. senni, Globorotalia sp., ?Eoconuloides parvulus, Globigerina sp. (high spired), Globigerina sp. (hispid) SR002332 Seward Sedimentary 951 HFS Tovs Orca Group -- Interbedded sedimentary and volcanic rocks Tertiary, Eocene and Paleocene Variable proportions of interbedded, tholeiitic basalt and turbidites. Basalt--pillowed and massive flows, pillow breccia, and tuff. Turbitdites--mudstone, siltstone, and fossiliferous volcanogenic sandstone. Metamorphosed to zeolite or prehnite-pumpelly CV003335 Cordova Sedimentary 951 Tosv Orca Group -- Interbedded sedimentary and mafic volcanic rocks Tertiary, Eocene (?) and Paleocene Locally variable amounts of volcanic and sedimentary rocks. In some cases unit is marginal to thicker sequences composed of pillowed and massive basalt flows. The lithologies are quite variable throughout the study area. In Ragged mountains volcaniclaForaminifers: Globigerina or Subbotina; Globigerina sp. (?) Globorotalia sp.; Globigerina cf. G. senni, Globorotalia sp., ?Eoconuloides parvulus, Globigerina sp. (high spired), Globigerina sp. (hispid) CV002332 Cordova Sedimentary 951 HFS Tops Orca Group -- Pillow basalt and sedimentary rocks Tertiary, Eocene (?) and Paleocene Pillow basalt, massive basalt flows, minor volcanic breccia interbedded with sandstone, siltstone, and shale. Distinguished from the interbedded sedimentary and mafic volcanics rocks unit on the basis of the predominance of pillow basalt in the section. CV002331 Cordova Igneous 951 Tops Orca Group: Pillow basalt and sedimentary rocks Tertiary, Eocene (?) and Paleocene Pillow basalt, massive basalt flows, minor volcanic breccia interbedded with sandstone, siltstone, and shale. Distinguished from the interbedded sedimentary and mafic volcanics rocks unit on the basis of the predominance of pillow basalt in the section. CV002331 Cordova Igneous 951 Tosv Ophiolite of Glacier Island - Volcaniclastic rocks Dark gray to green, moderate to well bedded volcanic mudstone and sandstone, poorly sorted, broken pillow breccia with angular clasts of pillow basalt, ranging in size from a few centimeters to 15-cm across, in a volcanic mudstone matrix, and rare pillow SR0053120 Seward Sedimentary 951 Toc Orca Group: Conglomerate Tertiary, Eocene (?) and Paleocene ORCA GROUP: Ranges from matrix-supported pebbly mudstone and sandstone to massive clast-supported pebble, cobble, and boulder conglomerate. The generally well-rounded clasts consist of various lithologies that have locally predominant types as follows:Crab: Branchioplax washingtoniana Pelecypod: Acila decisa BS002270 Blying Sound Sedimentary 952 Toc Orca Group: Conglomerate Tertiary, Eocene (?) and Paleocene ORCA GROUP: Ranges from matrix-supported pebbly mudstone and sandstone to massive clast-supported pebble, cobble, and boulder conglomerate. The generally well-rounded clasts consist of various lithologies that have locally predominant types as follows:Crab: Branchioplax washingtoniana Pelecypod: Acila decisa SR002270 Seward Sedimentary 952 Toc Orca Group: Conglomerate Tertiary, Eocene and Paleocene Massive, clast-supported, well-rounded pebble, cobble, and boulder conglomerate. Variable clast composition. CV003270 Cordova Sedimentary 952 Toc Orca Group: Conglomerate Tertiary, Eocene (?) and Paleocene Ranges from matrix-supported pebbly mudstone and sandstone to massive clast-supported pebble, cobble, and boulder conglomerate. The generally well-rounded clasts consist of various lithologies that have locally predominant types as follows: greenstone,Crab: Branchioplax washingtoniana Pelecypod: Acila decisa CV00270 Cordova Sedimentary 952 Tosa Orca Group - Conglomerate (Lithofacies A) Eocene and Paleocene Dark gray, poorly-bedded to massive, matrix-supported pebbly mudstone and sandstone to pebble, cobble, and boulder conglomerate. Minor lenses of sandstone and less or amounts of siltstone. Clasts are usually well-rounded and predominately sandstone and s SR0053096 Seward Sedimentary 952 Tots Orca Group -- Tuffaceous sedimentary rocks Tertiary, Eocene (?) and Paleocene Tuffaceous sedimentary rocks, volcaniclastic sandstone, and minor chert. Locally, these rocks contain abundant radiolarians and diatoms of probable Tertiary age (table 2). South of the Martin fault, this unit also includes minor pillow basalt and abundDiatoms: Arachinodiscus cf., A. ehrenbergii, Trinacria ef., T. pileclus Silicoflagellates: ?Corbisema geometrica, ?Corbisema hastata, ?Corbisema triacontha, Dictyocha aspera, Navoculopgis constricta MI002272 Middleton IslandSedimentary 953 Tots Orca Group -- Tuffaceous sedimentary rocks Tertiary, Eocene (?) and Paleocene Tuffaceous sedimentary rocks, volcaniclastic sandstone, and minor chert. Locally, these rocks contain abundant radiolarians and diatoms of probable Tertiary age (table 2). South of the Martin fault, this unit also includes minor pillow basalt and abundDiatoms: Arachinodiscus cf., A. ehrenbergii, Trinacria ef., T. pileclus Silicoflagellates: ?Corbisema geometrica, ?Corbisema hastata, ?Corbisema triacontha, Dictyocha aspera, Navoculopgis constricta CV002272 Cordova Sedimentary 953 Tf Lava flows Tertiary, middle to late? Andesitic to basaltic lavas and associated pyroclastic rocks. KN005512 Kenai Igneous 1000 2750 Td Intermediate, felsic and mafic dikes early Tertiary Dikes of dacite, rhyolite, andesite, and rare basalt; stored in coverage as arcs, arc-code = 50, arc-para1 = 0 Ar-AR isochron(?) age on andesite(?) of 57.0 Ma SV0020 Seldovia Igneous 1011 Td Dacite of Cape Saint Elias Tertiary, Miocene Described by Winkler and Plafker (1981, p. 18) as follows: "A prominent, very pale gray dacite plug complex forms the landmarks of Cape Saint Elias and Pinnacle Rock at the seward end of Kayak Island (Plafker, 1974). The dacite is very dense and hard, K-Ar date on dacite of 6.2 + or - 0.3 Ma. MI002405 Middleton IslandIgneous 1053 Td Dacite of Cape Saint Elias Tertiary, Pliocene or Miocene Prominent very pale gray dacite plug complex that forms Cape Saint Elias and Pinnacle Rock at southwestern end of Kayak Island. Dacite is very dense and hard and is conspicuously jointed. Microgranitic and porphyritic texture. Whole-rock K-Ar age of 6.2 Ma CV003200 Cordova Igneous 1053 Td Dacite of Cape Saint Elias Tertiary, Pliocene or Miocene Prominent very pale gray dacite plug complex that forms Cape Saint Elias and Pinnacle Rock at southwestern end of Kayak Island. Dacite is very dense and hard and is conspicuously jointed. Microgranitic and porphyritic texture. Whole-rock K-Ar age of 6.2 Ma MI003200 Cordova Igneous 1053 Tpv Poul Creek Formation -- Volcanic rocks, undivided Tertiary, Miocene, Oligocene, and Eocene Basaltic pyroclastic and flow rocks including minor pillowed flows; locally interbedded with marine sedimentary rocks, including tuffaceous or glauconitic strata, probably genetically related to mafic dikes, sills, and plugs of the mafic plugs unit (Tm) K/Ar date on whole rock of 31.2 + or - 1.3 Ma MI002320 Middleton IslandIgneous 1080 Tpv Poul Creek Formation: Volcanic rocks, undivided Tertiary, Miocene to Eocene Basaltic pyroclastic and flow rocks; locally interbedded with marine sedimentary rocks. Probably related genetically to mafic dikes, sills and plugs unit (Tm). CV003320 Cordova Igneous 1080 Tpv Poul Creek Formation: Volcanic rocks, undivided Tertiary, Miocene, Oligocene, and Eocene Basaltic pyroclastic and flow rocks including minor pillowed flows; locally interbedded with marine sedimentary rocks, including tuffaceous or glauconitic strata, probably genetically related to mafic dikes, sills, and plugs of the mafic plugs unit (Tm). K/Ar date on whole rock of 31.2 + or - 1.3 Ma CV00220 Cordova Igneous 1080 Tm Mafic dikes, sills, and plugs Tertiary, Oligocene Mafic dikes, sills, and plugs. Strongly altered intrusions of diabase, alkalic basalt, olivine basalt, and lamprophyre. Probably related genetically to extrusive volcanic rocks (Tpv) in Poul Creek Fm. CV003423 Cordova Igneous 1090 Tm Mafic plugs Tertiary, Oligocene (?) Only includes mafic plugs in the eastern Cordova quadrangle west of Nichawak Mountain; mainly in the Blying Sound quadrangle. Miller (1975) and Winkler and Plafker (1981) described the mafic plugs as coarse grained and diabasic with 45 percent euhedral CV00242 Cordova Igneous 1090 Tm Mafic plugs Tertiary, Oligocene (?) Only includes mafic plugs in the eastern Cordova quadrangle west of Nichawak Mountain mainly in the Blying Sound quadrangle. Miller (1975) and Winkler and Plafker (1981) described the mafic plugs as coarse grained and diabasic with 45 percent euhedral p CV002423 Cordova Igneous 1090 Tog Orca Group: Greenstone, undivided Tertiary, Paleocene and early Eocene (?) Probably pillow basalt, basaltic tuff, and sills. Few small areas of mafic igneous rock were also included in this map unit because classification of rocks is uncertain; they include an outcrop on Outpost Island not visited by authors, rocks with uncerta BS00427 Blying Sound Metamorphic 1135 Tog Orca Group: Greenstone, undivided Tertiary, Paleocene and early Eocene (?) Probably pillow basalt, basaltic tuff, and sills. Few small areas of mafic igneous rock were also included in this map unit because classification of rocks is uncertain; they include an outcrop on Outpost Island not visited by authors, rocks with uncerta SR00427 Seward Metamorphic 1135 Tov Orca Group: Volcanic rocks, undivided Tertiary, Eocene (?) and Paleocene Mostly tabular or lenticular bodies of mafic volcanic rocks altered to greenstone and not examined in detail. As mapped, may include pillowed or massive flows, broken pillow breccia, tuff, and dikes. SR002333 Seward Igneous 1135 Tov Orca Group: Volcanic rocks, undivided Tertiary, Eocene and Paleocene Thick and thin tabular bodies of altered tholeiitic basalt. Pillowed, massive or crudely columnar flows; pillow breccia, aquagene tuff, and diabase or gabbro sills. Local interbedding of mudstone and siltstone. Metamorphosed to zeolite or prehnite-pumpel CV003333 Cordova Igneous 1135 Tov Orca Group: Volcanic rocks, undivided Tertiary, Eocene (?) and Paleocene Mostly tabular or lenticular bodies of mafic volcanic rocks altered to greenstone and not examined in detail. As mapped, may include pillowed or massive flows, broken pillow breccia, tuff, and dikes. CV00233 Cordova Igneous 1135 Top Orca Group: Pillow basalt Tertiary, Paleocene and early Eocene (?) Pale- to dark-green aphyric to porphyritic, commonly amygdaloidal, pillow basalt composed of plagioclase and clinopyroxene; plagioclase is generally replaced by albite and(or) chloritie; vesticles mostly filled with chlorite; pillow basalt in some areas BS00417 Blying Sound Igneous 1136 Kvp Valdez Group: Pillow basalt Late Cretaceous Pale- to dark-green aphyric to porphyritic, frequently amygdaloidal, pillow basalt composed to plagioclase and clinopyroxene; plagioclase commonly replaced by albite and epidote, and clinopyroxene by hornblende, actinolite, and(or) chlorite; vesticles mo BS00433 Blying Sound Igneous 1136 Top Orca Group: Pillow basalt Tertiary, Paleocene and early Eocene (?) Pale- to dark-green aphyric to porphyritic, commonly amygdaloidal, pillow basalt composed of plagioclase and clinopyroxene; plagioclase is generally replaced by albite and(or) chloritie; vesticles mostly filled with chlorite; pillow basalt in some areas SR00417 Seward Igneous 1136 Kvp Valdez Group: Pillow basalt Late Cretaceous Pale- to dark-green aphyric to porphyritic, frequently amygdaloidal, pillow basalt composed to plagioclase and clinopyroxene; plagioclase commonly replaced by albite and epidote, and clinopyroxene by hornblende, actinolite, and(or) chlorite; vesticles mo SR00433 Seward Igneous 1136 Top Orca Group: Pillow basalt Tertiary, Eocene (?) and Paleocene Pillow breccia and massive flows are subordinate in quantity to pillow basalt. Minor intercalated sedimentary rocks are predominantly siliceous mudstone and argillite. Interpillow material consists of silicious mudstone, sandstone, or carbonate rocks. BS002330 Blying Sound Igneous 1136 Top Orca Group: Pillow basalt Tertiary, Eocene (?) and Paleocene Pillow breccia and massive flows are subordinate in quantity to pillow basalt. Minor intercalated sedimentary rocks are predominantly siliceous mudstone and argillite. Interpillow material consists of silicious mudstone, sandstone, or carbonate rocks. SR002330 Seward Igneous 1136 Kvp Valdez Group: Pillow basalt Late Cretaceous Pillow basalt and lesser massive basalt and broken pillow breccia make up most of the western flank of the mafic complex on the Resurrection Peninsula. These pillow basalts from a west-dipping sequence and contain minor amounts of interbedded siliceous BS002612 Blying Sound Igneous 1136 Top Orca Group: Pillow basalt Tertiary, Eocene (?) and Paleocene Pillow breccia and massive flows are subordinate in quantity to pillow basalt. Minor intercalated sedimentary rocks are predominantly siliceous mudstone and argillite. Interpillow material consists of silicious mudstone, sandstone, or carbonate rocks. CV002330 Cordova Igneous 1136 Top Ophiolite of Glacier Island - Pillow basalt Tertiary, Eocene (?) and Paleocene (added) Dark gray or green pillow basalt flows and minor massive basalt flows. Basalts are fine to medium grained, porphyritic with phenocrysts of plagioclase and clinopyroxene; olivine is present but not abundant. Pillows average 0.3 m in diameter. Altered brow SR0053123 Seward Igneous 1136 Kvd Valdez Group: Sheeted basalt dikes Late Cretaceous Dark-green, gray, and brown aphyric to porphyritic and locally gabbroic dikes composed mainly of plagioclase and clinopyroxene; olivine present in a few dikes; plagioclase generally is replaced by albite, and clinopyroxene commonly replaced by hornblende BS00435 Blying Sound Igneous 1137 Tod Orca Group: Sheeted basalt dikes Tertiary, Paleocene and early Eocene (?) Dark-green, gray, and brown aphyric to porphyritic and gabbroic dikes composed mainly of plagioclase and clinopyroxene; plagioclase and clinopyroxene; felsic plagioclase-quartz dikes occur locally; plagioclase-clinopyroxene-olivine dikes are present but SR00421 Seward Igneous 1137 Kvd Valdez Group: Sheeted basalt dikes Late Cretaceous Dark-green, gray, and brown aphyric to porphyritic and locally gabbroic dikes composed mainly of plagioclase and clinopyroxene; olivine present in a few dikes; plagioclase generally is replaced by albite, and clinopyroxene commonly replaced by hornblende SR00435 Seward Igneous 1137 Tod Orca Group: Sheeted dikes Tertiary, Eocene (?) and Paleocene ORCA GROUP: Mafic sheeted-dike complexes in the Orca Group occur on Knight and Glacier Islands. The dikes are basaltic in composition and display diabasic, equigranular, and porphyritic textures. Phenocrysts of plagioclase and clinopyroxene are common SR002334 Seward Igneous 1137 Kvd Valdez Group: Sheeted dikes Late Cretaceous Mafic sheeted dikes forming the topographically rugged crest of the Resurrection Peninsula are similar to the sheeted dikes unit of the Orca Group on Knight Island. Most dikes are 3 to 6 ft thick, vertical, and generally have a parallel north-south orie BS002613 Blying Sound Igneous 1137 Kvd Valdez Group: Sheeted dikes Late Cretaceous Mafic sheeted dikes forming the topographically rugged crest of the Resurrection Peninsula are similar to the sheeted dikes unit of the Orca Group on Knight Island. Most dikes are 3 to 6 ft thick, vertical, and generally have a parallel north-south orie SR002613 Seward Igneous 1137 Tod Ophiolite of Glacier Island - Sheeted dikes Tertiary, Eocene (?) and Paleocene (added) Mafic sheeted dikes are basaltic in composition and form the lower oceanic-crust part of the ophiolite of Glacier Island. The dikes are diabasic, equigranular, and porphyritic. Phenocrysts of plagioclase and clinopyroxene are common. Facings on chilled m 37.6Ma ñ0.6, plag, plateau age SR0053128 Seward Igneous 1137 Ti Intrusive rocks Tertiary Dikes, sills, and stock-lke masses of felsic to mafic composition KN0021200 Kenai Igneous 1200 Tgc Cedar Bay granite Tertiary, Eocene (?) Light-gray and pink medium- and coarse-grained muscovite (biotite) granite; plagioclase ranges from oligoclase to andesine in composition, and biotite is commonly less than 1 percent. SR0049 Seward Igneous 1270 Tg Granite and granodiorite Tertiary, Oligocene The central part of the plutons are dominantly light-gray, medium- to coarse-grained granite with color index ranging from 3 to 8. The plutons grade outward to fine- to medium-grained, more mafic mineral-rich (color indices of 10 to 20) margins of grani K/Ar dates from 34.2 + or - 1.7 to 36.2 + or - 1 Ma. SR002420 Seward Igneous 1270 Tg Leucocratic Granite Oligocene Light colored, leucocratic biotite granite. Color index 5. Common textures are allotriomorphic granular and hypidiomorphic granular. Comprises several igneous bodies - plutons of Cedar Bay, Terentiev Lake, Granite Cove, and Columbia Glacier stock and an Ar/Ar 25.4 ñ0.1 Ma, kspar, plateau age; 29.2 ñ0.3 Ma, microcline, isochron age; 31.7 ñ0.1 Ma, kspar, plateau age; 29.2 ñ0.1 Ma, kspar, plateau ageSR0053119 Seward Igneous 1270 Tg Granodiorite and granite Tertiary, Oligocene Light-gray medium- to coarse-grained biotite (hornblende) granodiorite and granite stocks of central part of map area; larger stocks commonly grade from marginal zones containing more biotite (and locally hornblende) inward to more leucocratic zones; lar K/Ar dates on biotite of about 36.6 m.y., 35.5, 36.1, and 36.2 Ma; K/Ar date on hornblende of about 34.4 Ma. SR0045 Seward Igneous 1273 Tgb Gabbro Tertiary, Oligocene, Eocene, or Paleocene Dark-gray fine- to medium-grained locally porphyritic gabbro composed of subequal amounts of labradorite and clinopyroxene; locally contains olivine on Esther Island; pyroxene largely altered to hornblende north of Paddy Bay. SR0047 Seward Igneous 1294 Tgd Gabbro and diorite Tertiary, Oligocene Consists of mafic rocks belonging to one of the main intrusive events. These rocks are dominantly medium- to coarse-grained gabbro (labradorite-bearing) and subordinate diorite (andesine-bearing) with finer grained borders of quartz gabbro and quartz di K/Ar date of 36.6 +/- 1.01 Ma indicating a chronological relation to the granite and granodiorite unit (Tg). SR002421 Seward Igneous 1294 Tg Granitoid rocks Tertiary, Eocene Granitoid rocks-- Biotite and biotite-hornblende granodiorite, granite, and minor tonalite; generally medium grained, hypidiomorphic, and equigranular; foliated in many places, especially near contacts with country rocks. K-Ar ages from 50.5 to 53.5 Ma CV003205 Cordova Igneous 1300 Tgg Granite and granodiorite Tertiary, Eocene Generally medium- and medium- to coarse-grained hypidiomorphic-granular biotite granite with border phases of biotite + or - hornblende granite to granodiorite and tonalite. Plutons of this unit are generally medium- and medium- to coarse-grained hypidi Six K/Ar ages on hornblende, biotite, and phlogopite ranging from 50.5 to 53.5 Ma CV002440 Cordova Igneous 1300 Tf Felsite Dikes Tertiary Includes two types: (1) leucocratic porphyry dikes with 20%-30% euhedral phenocrysts of potassium feldspar and quartz in a fine grained allotriomorphic groundmass. Intrudes only the Orca Group; (2) allotriomorphic granular, white weathering, fine grained Ar/Ar 38.6 ñ0.6 Ma, biotite, plateau age; 40 ñ1 Ma, biotite, disturbed, wt. avg.; 31.1 ñ 0.2 Ma, kspar, isochron age SR0053107 Seward Igneous 1301 Ti3 Tonalite Tertiary Mostly biotite tonalite but also includes biotite-muscovite +/- garnet tonalite and trondhjemite. Includes both weakly foliated, syn-D plutons (Ti3a) and unfoliated, post D plutons (Ti3b) CV005505 Cordova Igneous 1310 Ti2 Tonalite Tertiary Mostly hornblende-biotite tonalite but also includes biotite tonalite. Strongly foliated and lineated plutons with fabrics subparallel to D2 in adjacent metamorphic rocks CV005506 Cordova Metamorphic 1310 Ti2 Tonalite Tertiary Mostly hornblende-biotite tonalite but also includes biotite tonalite. Strongly foliated and lineated plutons with fabrics subparallel to D2 in adjacent metamorphic rocks CV006504 Cordova Metamorphic 1310 Ti3b Tonalite Tertiary Mostly biotite tonalite, but also some biotite-muscovite +/- garnet trondhjemite and granodiorite. Unfoliated plutonic rocks CV006508 Cordova Igneous 1310 Ti3a Tonalite Tertiary Mostly biotite tonalite, weakly foliated, syn-D plutons CV006512 Cordova Metamorphic 1310 Tg Granodiorite Tertiary, Eocene Medium- and coarse-grained biotite granodiorite U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0 SV002113 Seldovia Igneous 1320 Tgh Granite of Harding Icefield region Tertiary, Eocene Medium- to dark-gray foliated amdium- to coarse-grained biotite-muscovite-(hornblende) granite and granodiorite; marginal phases are locally biotite-muscovite-(hornblende) tonalite; mafic minerals, almost wholly biotite, constitute 20 to 30 percent of mi K/Ar dates on biotite of about 59.2 m.y. and on muscovite of about 54.6 m.y. BS00411 Blying Sound Igneous 1320 Tgh Granite of Harding Icefield region Tertiary, Eocene Medium- to dark-gray foliated medium- to coarse-grained biotite-muscovite-(hornblende) granite and granodiorite; marginal phases are locally biotite-muscovite-(hornblende) tonalite; mafic minerals, almost wholly biotite, constitute 20 to 30 percent of mi K/Ar dates on biotite of about 59.2 m.y. and on muscovite of about 54.6 m.y. SR00411 Seward Igneous 1320 Tgg Granite and granodiorite Tertiary, Eocene Generally medium- and medium- to coarse-grained hypidiomorphic-granular biotite granite with border phases of biotite + or - hornblende granite to granodiorite and tonalite. Plutons of this unit are generally medium- and medium- to coarse-grained hypidi Six K/Ar ages on hornblende, biotite, and phlogopite ranging from 50.5 to 53.5 Ma SR002440 Seward Igneous 1320 Tgh Granodiorite Tertiary, Eocene Medium- and coarse-grained biotite granodiorite of the Aialik pluton and Paguna stock -- assigned to granitic rocks of the Harding Icefield. Same as NSA 1200 of source KN003 U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0 SV0099113 Seldovia Igneous 1320 Tgh Granodiorite Tertiary, Eocene Granitic rocks of the Harding Icefield extrapolated from description of Tysdal and Case (1979) in the adjoining Seward quadrangle. Nunataks were mapped by Magoon and others (1976) as Valdez Group. U-Pb monazite age of 56.0, Ar-Ar biotite ages of 54.2, 53.2, 53.4,53.7, and 54.0 KN0151513 Kenai Igneous 1320 Kvg Valdez Group: Gabbro Late Cretaceous Green massive medium- to coarse-grained and locally pegmatitic gabbro composed chiefly of labradorite and clinopyroxene; commonly altered to varying degreens; pyroxene altered to green hornblende which is partly replaced by actinolite and(or) chlorite; p BS00437 Blying Sound Igneous 1374 Togb Orca Group: Gabbro and diorite Tertiary, Paleocene and early Eocene (?) ORCA GROUP: Medium- and dark-gray to green coarse-grained chiefly clinopyroxene-plagioclase rocks with ophitic to subophitic texture and gabbroic to dioritic composition; locally pegmatitic with clinopyroxene crystals as much as 5 cm long; clinopyroxene SR00425 Seward Igneous 1374 Kvg Valdez Group: Gabbro Late Cretaceous Green massive medium- to coarse-grained and locally pegmatitic gabbro composed chiefly of labradorite and clinopyroxene; commonly altered to varying degreens; pyroxene altered to green hornblende which is partly replaced by actinolite and(or) chlorite; p SR00437 Seward Igneous 1374 Togb Orca Group: Gabbro Tertiary, Eocene (?) and Paleocene ORCA GROUP: Several small intrusive bodies of gabbro occur on Knight Island. The largest body crops out east of Drier Bay, where it intrudes sheeted dikes. Other gabbro bodies that have been reported are too small to show at the scale of this map. Mo SR002470 Seward Igneous 1374 Kvgb Valdez Group: Gabbro Late Cretaceous Two north-south-trending plutons of medium- to coarse-grained gabbro occur east of the sheeted dikes unit on the Resurrection Peninsula. Several features are displayed in shoreline exposures of the westernmost pluton that were not observed in the easter BS002614 Blying Sound Igneous 1374 Kvgb Valdez Group: Gabbro Late Cretaceous Two north-south-trending plutons of medium- to coarse-grained gabbro occur east of the sheeted dikes unit on the Resurrection Peninsula. Several features are displayed in shoreline exposures of the westernmost pluton that were not observed in the easter SR002614 Seward Igneous 1374 Tou Orca Group: Ultramafic rocks Tertiary, Eocene (?) and Paleocene ORCA GROUP: Two of these peridotite bodies occur within or near major shear zones in the sheeted dikes unit; only the larger (650 by 1,300 ft body is shown in the Port Audry shear zone. The third body occurs as a xenolith in sheeted dikes. The ultrama SR002471 Seward Igneous 1375 Tmu Mafic and ultramafic plutonic rocks Tertiary, Eocene and Paleocene? Mafic and ultramafic plutonic rocks-- Compositionally and texturally variable unit consists mainly of medium grained gabbro, local diabase, hornblende gabbro, peridotite, and orthopyroxenite. Gabbro is slightly to moderately foliated except near contacts CV003210 Cordova Igneous 1380 Kvu Valdez Group: Ultramafic rocks Late Cretaceous Serpentinized peridotite and dunite occur at three localities underlain by the Valdez Group: two of these are on the Resurrection Peninsula and the third is near the head of Port Fidalgo. This description represents the third at Port Fidalgo. The thir CV0025533 Cordova Igneous 1380 TKu Plutonic rocks, undivided Tertiary and Cretaceous Plutonic rocks KN0121203 Kenai Igneous 1650 TKgd Granodiorite, quartz diorite, and diorite Tertiary or late Cretaceous KN0022905 Kenai Igneous 1660 Kk Kaguyak Formation, nonmarine sedimentary rocks Late Cretaceous Sandstone, conglomerate, siltstone and interbedded coal (Not in Bradley, but cited in Magoon and others, 1980): Sporomorphs: Cranwellia striata Srivastava, Balmeisporites spp., Wodehouseia spinata Stanley, Proteacidites spp., Aquilapollenites bertillonites Funkhouser, A. reticulatus Mtchedlishvili, A delica SV00272 Seldovia Sedimentary 1961 KPm McHugh Complex, undivided Cretaceous to Permian Complexly deformed tectonic assemblage of diverse lithologies (melange). Lithologies include argillite, tuff, graywacke, basalt, chert, outcrop-scale melange, conglomerate, gabbro, and limestone. Rocks typically show prehnite-pumpellyite facies metamorPermian conodonts and fusilinids. SV00277 Seldovia Tectonite 2190 KJm McHugh Complex Cretaceous and (or) Jurassic Weakly metamorphosed siltstone, graywacke, arkose, and conglomeratic sandstone; greenstone (mostly basaltic), metachert, and argillite KN0032190 Kenai Tectonite 2190 KJm McHugh Complex Cretaceous and (or) Late Jurassic Between Border Ranges fault and unnamed fault: melange of siltstone, sandstone, mud-chip sandstone, conglomeratic sandstone, tuff, and less abundant gabbro, serpentinite, bedded chert, and pillow basalt; fine-grained sedimentary strata commonly streaked SR00443 Seward Sedimentary 2190 KJm? McHugh Complex Late Jurassic and (or) Cretaceous Between unnamed fault and Eagle River thrust fault (?): massive sandstone that is brown, tan, and gray-green thick-bedded ridge-forming medium- and coarse-grained locally conglomeratic sandstone; abundantmud chips give rock a distinct spotted appearance SR00444 Seward Tectonite 2190 Km McHugh Complex Early Cretaceous Description from Clark (1981, p. 3-4) "The McHugh Complex is a heterogeneous, chaotic assemblage that includes metamorphosed clastic and volcanic rocks of diverse ages. The clastic rocks, which are the most abundant, comprise thick, fault-bounded sequen SR002650 Seward Tectonite 2190 Ju Interstratified graywacke-argillite and volcanic rocks Jurassic? Interstratified graywacke-argillite and volcanic rocks. Highly folded and fractured. Exposed at surface or beneath thin discontinuous deposits of Quaternary age KN013302 Kenai Tectonite 2190 KPms McHugh Complex, graywacke and conglomerate Early Cretaceous to Early Jurassic (Pliensbachian) Fault-bounded slices of massive conglomerate and graywacke. Pliensbachian radiolaria in underlying ribbon chert SV00275 Seldovia Sedimentary 2198 KPmc McHugh Complex, basalt and chert Early Cretaceous (Albian) to Middle Triassic (Ladinian)Pillow and massive basalt, depositionally overlain by radiolarian chert. Cretaceous to Triassic radiolaria in bedded chert SV00274 Seldovia Tectonite 2199 Kd Intermediate dike Early Cretaceous Basalt-andesite dike intruding McHugh Complex. Stored in coverage as arcs, arc-code = 50 and arc-para1 = 5 Ar-Ar hornblende plateau age of 115 Ma SV0020 Seldovia Igneous 2401 Ku Plutonic rocks, undivided Late Cretaceous Plutonic rocks, undivided KN009902 Kenai Igneous 2410 Ki12 Cretaceous intrusive rocks -- Unit 12 Quartz diorite Cretaceous Locally foliated, seriate hornblende-biotite quartz diorite. Biotite-hornblende rationis quite variable although color index remains constant. Deuteric epidote common. Extension from adjacent Lake Clark quadrangle KN008172 Kenai Igneous 2430 Kv Valdez Group Late Cretaceous Thick sequences of drab, rythmically alternating multiply deformed turbidites, including metasandstone, metasiltstone, argillite, slate, and phyllite, and rare beds of pebbly argillite and metasandstone; generally beds are a few centimeters to a few metMaestrichtian and Campanian(?) Inoceramus SV00271 Seldovia Metamorphic 2700 KJv Valdez Group (?) Cretaceous and Jurassic (?) Metawacke, metasiltstone, and argillite; locally phyllitic KN0032700 Kenai Metamorphic 2700 Kv Valdez Group: Sedimentary rocks, undivided Late Cretaceous Dark-gray thin- to thick-bedded sandstone, siltstone, and mudstone flysch; sandstone is fine to coarse grained and mainly is composed of plagioclase, quartz, and igneous rock fragments, the third ranging from a few percent to as much as 40 percent of rocMollusc. Inoceramus kusiroensis Maestrichtian Late Cretaceou ) BS00429 Blying Sound Sedimentary 2700 Kv Valdez Group: Sedimentary rocks, undivided Late Cretaceous Dark-gray thin- to thick-bedded sandstone, siltstone, and mudstone flysch; sandstone is fine to coarse grained and mainly is composed of plagioclase, quartz, and igneous rock fragments, the third ranging from a few percent to as much as 40 percent of rocMollusc. Inoceramus kusiroensis Maestrichtian Late Cretaceou ) SR00429 Seward Sedimentary 2700 Kvs Valdez Group: Sedimentary rocks, undivided Late Cretaceous Thick sequences of deformed and metamorphosed flysch consisting of metasandstone, metasiltstone, argillite, slate, and phyllite, with rare beds of conglomerate and pebbly argillite. In many places primary internal sedimentary structures, consisting of gPelecypod: Inoceramus kusiroensis, Inoceramus ulrichi, and Inoceramya concentrica K/Ar date on biotite semischist of 51.5 + or - 1.5 Ma SR002510 Seward Sedimentary 2700 Kvs Valdez Group: Metasedimentary rocks, undivided Late Cretaceous Thick sequence of rhythmically alternating, multiply-deformed, metamorphosed turbidites that consist of metasandstone, metasiltstone, argillite, slate and phyllite and rare beds of pebbly argillite. Beds generally a few centimeters to a few meters thick. CV003511 Cordova Metamorphic 2700 Kvs Valdez Group: Sedimentary rocks, undivided Late Cretaceous Thick sequences of deformed and metamorphosed flysch consisting of metasandstone, metasiltstone, argillite, slate, and phyllite, with rare beds of conglomerate and pebbly argillite. In many places primary internal sedimentary structures, consisting of gPelecypod: Inoceramus kusiroensis, Inoceramus ulrichi, and Inoceramya concentrica K/Ar date on biotite semischist of 51.5 + or - 1.5 Ma CV002510 Cordova Sedimentary 2700 Ku Graywacke-argillite and other consolidated rocks Cretaceous Graywacke-argillite and other consolidated rocks. Highly folded and fractured. Exposed at surface or beneath thin discontinuous deposits of Quaternary age KN013301 Kenai Sedimentary 2700 Ku Graywacke-argillite and other consolidated rocks Cretaceous Graywacke-argillite and other consolidated rocks. Highly folded and fractured. Exposed at surface or beneath thin discontinuous deposits of Quaternary age SV007301 Seldovia Sedimentary 2700 Kvvs Valdez Group: Interbedded volcanic and sedimentary rocks Late Cretaceous This unit is composed of approximately equal amounts of interbedded volcanic rocks, consisting of volcanic breccia, tuff, tuffaceous sediment, and minor pillow basalt, and sedimentary rocks, consisting of sandstone, siltstone, shale, and chert. The two K-Ar date on amphibote-bearing greenschist of 47.6 + or - 1.4 Ma was reported, those source rocks are now assigned to Orca Group SR002554 Seward Igneous 2702 Kvvs Valdez Group: Interbedded metavolcanic and metasedimentary rocks Late Cretaceous Equal proportions of interbedded metavolcanic and metasedimentary rocks. Metavolcanic--semischistose metatuff and breccia and minor pillow basalt. Metasedimentary--slate, phyllite, with metasilstone and metasandstone interbedding. Variable metamorphic gr CV003555 Cordova Metamorphic 2702 Kvvs Valdez Group: Interbedded volcanic and sedimentary rocks Late Cretaceous This unit is composed of approximately equal amounts of interbedded volcanic rocks, consisting of volcanic breccia, tuff, tuffaceous sediment, and minor pillow basalt, and sedimentary rocks, consisting of sandstone, siltstone, shale, and chert. The two K-Ar date on amphibote-bearing greenschist of 47.6 +/- 1.4 Ma was reported, those source rocks are now assigned to Orca Group CV002554 Cordova Igneous 2702 Kvv Valdez Group: Metavolcanic rocks, undivided Late Cretaceous Tholeiitic metabasalt and basaltic metatuff, including local pillow lava, pillow breccia, and gabbroic dikes and sills. Metabasalt forms rugged, nearly massive outcrops, whereas semischistose metatuff forms more subdued outcrops. Variable metamorphic gra CV003515 Cordova Metamorphic 2705 Kvgr Valdez Group: Greenstone Late Cretaceous This unit consists of massive greenstone, metamorphosed pillow basalt, and mafic dikes exposed near the heads of Woodworth and Schwan Glaciers. Elsewhere in the Cordova and Valdez quadrangles, the unit includes lenticular bodies of chorite schist that m CV002611 Cordova Metamorphic 2705 Kvt Tuff Late Cretaceous Green to dark-gray fine-grained finely laminated tuff with plagioclase phenocrysts; metamorphosed to chlorite and biotite zones of greenschist facies; chlorite, epidote, and locally actinolite are abundant; remnants of glossy shards are present. BS00431 Blying Sound Igneous 2706 Kvt Tuff Late Cretaceous Green to dark-gray fine-grained finely laminated tuff with plagioclase phenocrysts; metamorphosed to chlorite and biotite zones of greenschist facies; chlorite, epidote, and locally actinolite are abundant; remnants of glossy shards are present. SR00431 Seward Igneous 2706 Kvu Valdez Group: Ultramafic rocks Late Cretaceous Dunite, locally with layers of chromite, moderately to mostly altered to serpentine, serpentine-talc, and talc schist; lustrous pale- to dark-green and black, locally reddish weathering rock that forms dike-like and irregularly shaped intrusive bodies SR00439 Seward Igneous 1375 Kvu Valdez Group: Ultramafic rocks Late Cretaceous Serpentinized peridotite and dunite occur at three localities underlain by the Valdez Group: two of these are on the Resurrection Peninsula and the third is near the head of Port Fidalgo. On the Resurrection Peninsula small sparse inclusions of altered SR002553 Seward Igneous 1375 Kvu Valdez Group: Ultramafic rocks Late Cretaceous Serpentinized peridotite and dunite occur at three localities underlain by the Valdez Group: two of these are on the Resurrection Peninsula and the third is near the head of Port Fidalgo. This description reflects the two localities on the Resurrection CV002553 Cordova Igneous 1375 Kvm Melange of Iceworm Peak Late Cretaceous Tectonic melange consisting of blocks of graywacke in a phacoidally cleaved matrix of slate having a Valdez Group protolith for both matrix and blocks. SV0021071 Seldovia Tectonite 2708 Kvm Melange of Iceworm Peak Late Cretaceous Tectonic melange consisting of blocks of graywacke in a phacoidally cleaved matrix of slate having a Valdez Group protolith for both matrix and blocks. KN0033708 Kenai Tectonite 2708 Kvs Schist, Valdez Group Late Cretaceous Schistose, interbedded siltstone, graywacke, and less abundant tuff, tufaceous sandstone, and basalt (pillow basalt?); igneous rocks are typically dark green, metasiltstone is shiny steel gray, and metasandstone is dark gray; metamorphosed chiefly to bio BS00441 Blying Sound Metamorphic 2710 Kvs Schist, Valdez Group Late Cretaceous Schistose, interbedded siltstone, graywacke, and less abundant tuff, tufaceous sandstone, and basalt (pillow basalt?); igneous rocks are typically dark green, metasiltstone is shiny steel gray, and metasandstone is dark gray; metamorphosed chiefly to bio SR00441 Seward Metamorphic 2710 Kvm Valdez Group: Schist Late Cretaceous Homogenous pelitic schist and minor amphibolite; includes spotted biotite-plagioclase-quartz schist. Common banding probably represents original layering. Transitional into gneissose rocks to the east and into greenschist-facies rocks of metasedimentary CV003600 Cordova Metamorphic 2710 Kvg Valdez Group: Gneiss Late Cretaceous Muscovite-biotite-quartz-plagioclase (+/- sillimanite and garnet) schist, banded gneiss, and migmatitic gneiss; many local intrusive stringers, dikes, and sills of granodiorite and granite. Transitional into schistose rocks to the north, south, and west. CV003609 Cordova Metamorphic 2715 Kvg Valdez Group: Paragneiss Late Cretaceous Predominantly metasedimentary rocks with well-developed gneissic foliation consisting of alternating quartz and feldspar-rich layers with biotite-rich layers. The paragneiss is brown weathering, medium grained, and banded on a 2 to 4 mm scale. However, CV002610 Cordova Metamorphic 2715 green Schist Cretaceous ? Upper greenschist to amphibolite facies schist derived from metamorphism of interbedded graywacke and argillite of the Valdez Group CV005507 Cordova Metamorphic 2715 pink Transitional gneiss Age not given Upper amphibolite facies schist and gneiss interlayered at scale of meters to centimeters. Top of unit marked by appearance of quartofeldspathic segregations in metapelite and base of unit marked by loss of stratal continuity through development of gnei CV005508 Cordova Metamorphic 2715 gray Gneiss Age not given Gray, banded quartzofeldspathic gneiss CV005509 Cordova Metamorphic 2715 green Schist Cretaceous ? Upper greenschist to amphibolite facies schist derived from metamorphism of interbedded graywacke and argillite of the Valdez Group CV006505 Cordova Metamorphic 2715 pink Transitional gneiss Age not given Upper amphibolite facies schist and gneiss interlayered at scale of meters to centimeters. Top of unit marked by appearance of quartofeldspathic segregations in metapelite and base of unit marked by loss of stratal continuity through development of gnei CV006506 Cordova Metamorphic 2715 gray Gneiss Age not given Gray, banded quartzofeldspathic gneiss CV006507 Cordova Metamorphic 2715 orange Orthogneiss Age not given Metamorphosed plutonic rocks. Mostly Ti2 plutons within the gneissic core of the complex CV006509 Cordova Metamorphic 2715 Tgd Granodioritic rocks Tertiary Granodiorite and quartz diorite Age assigned revised based on Nelson and others (1983) KN0021350 Kenai Igneous 2900 Js Sedimentary rocks Jurassic Sedimentary rocks, undifferentiated SV0055300 Seldovia Sedimentary 3000 Js Sedimentary rocks Jurassic Sedimentary rocks, undifferentiated KN01111300Kenai Sedimentary 3000 Jn Naknek Formation Late Jurassic (Oxfordian to Kimmeridgian) Arkose, conglomerate, sandstone, siltstone, and shale Ammonites and pelecypods, especially Buchia which provides tight age control SV00247 Seldovia Sedimentary 3010 Jn Naknek Formation Late Jurassic Sandstone, arkose, conglomerate, and siltstone KN0023010 Kenai Sedimentary 3010 Jnss Naknek Formation, lower sandstone member Late Jurassic Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region KN005516 Kenai Sedimentary 3012 Jnss Naknek Formation, lower sandstone member Late Jurassic Thin-bedded to massive arkosic sandstone, graywacke, and siltstone, mainly restricted to central part of region SV004516 Seldovia Sedimentary 3012 Jns Naknek Formation, Snug Harbor Siltstone Member Late Jurassic Massive to thin-bedded dark-gray to black siltstone; laminated near base KN005515 Kenai Sedimentary 3013 Jns Naknek Formation, Snug Harbor Siltstone Member Late Jurassic Massive to thin-bedded dark-gray to black siltstone; laminated near base SV004515 Seldovia Sedimentary 3013 Jnp Naknek Formation, Pomeroy Arkose Member Late Jurassic Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone KN005514 Kenai Sedimentary 3014 Jnp Naknek Formation, Pomeroy Arkose Member Late Jurassic Massive light-gray arkose and arkosic conglomerate; minor interbeds of siltstone SV004514 Seldovia Sedimentary 3014 Jnc Naknek Formation, Chisik Conglomerate Member Late Jurassic Massive cobble-boulder conglomerate, mainly restricted to area adjacent to Iniskin Bay and Tuxedni Bay KN005517 Kenai Sedimentary 3016 Jcp Chinitna Formation, Paveloff Siltstone Member Late Jurassic Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base KN005518 Kenai Sedimentary 3020 Jcp Chinitna Formation, Paveloff Siltstone Member Late Jurassic Massive to thin-bedded gray arenaceous siltstone, weathers gray, large ellipsoidal concretions and lenticular beds of limestone, massive sandstone unit at base SV004518 Seldovia Sedimentary 3020 Jc Chinitna Formation Late Jurassic (Callovian) Primarily dark-gray to brown massive arenacous siltstone containing a few sandstone interbeds and numerous limestone concretions. Unit is subdivided into members, however not on this map Abundant fossils, including many species of ammonites: Cadoceras, C. stenocadoceras, C. pseudocadoceras, Kepplerites, Kheraiceras, Lilloettia, and Gowericeras. Also especially known for Iniskinites and Chinitnites SV00232 Seldovia Sedimentary 3025 Jc Chinitna Formation Late Jurassic Siltstone, limestone concretions, and sandstone KN0023030 Kenai Sedimentary 3025 Jct Chinitna Formation, Tonnie Siltstone Member Late Jurassic Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base KN005519 Kenai Sedimentary 3030 Jct Chinitna Formation, Tonnie Siltstone Member Late Jurassic Massive to thin-bedded brownish-gray arenaceous siltstone, weathers red-brown, small yellowish-brown limestone concretions in parallel bands, minor sandstone at base SV004519 Seldovia Sedimentary 3030 Jtu Tuxedni Formation Middle to Late Jurassic (Bajocian to Callovian) Light- to dark-gray and green graywacke, conglomerate, siltstone, and shale. Graywacke ranges from feldspathic to lithic to laumontitic; conglomerate composed mainly of volcanic clasts in a graywacke matrix. Unit is subdivided into Formation, however nAbundantly fossiliferous, containing ammonites and pelecypods. Key ammonites include Erycites, Tmetoceras, Sonninia, Stemmatoceras, Emileia, Stephanoceras, Chondroceras, and many others SV00250 Seldovia Sedimentary 3180 Jt Tuxedni Formation Middle Jurassic Sandstone, siltstone, and limy concretions KN0023180 Kenai Sedimentary 3180 Jtb Tuxedni Group, Bowser Formation Middle and Late Jurassic Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes. Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula. The sandstone and the conAbundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic. The lower faunal zone immediately overlies the unconformity with the Twist KN005520 Kenai Sedimentary 3181 Jtb Tuxedni Group, Bowser Formation Middle and Late Jurassic Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes. Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Peninsula. The sandstone and the conAbundantly fossiliferous, containing ammonites and pelecypods, the units can be divided into two faunal zones which correspond to the break between the Middle and Upper Jurassic. The lower faunal zone immediately overlies the unconformity with the Twist SV004520 Seldovia Sedimentary 3181 Jtt Tuxedni Group, Twist Creek Siltstone Middle Jurassic Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick. The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color. Small limestone Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites) KN005521 Kenai Sedimentary 3182 Jtt Tuxedni Group, Twist Creek Siltstone Middle Jurassic Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125-m-thick. The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright orange color. Small limestone Abundant ammonite fauna which includes Oppelia (Liroxyites), Megasphaerceras, Leptoshinctes, Lissoceras, and Normannites (Dettermanites) SV004521 Seldovia Sedimentary 3182 Jtc Tuxedni Group, Cynthia Falls Sandstone Middle Jurassic Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick. The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding. The sandstone consistsThe sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp. KN005522 Kenai Sedimentary 3183 Jtc Tuxedni Group, Cynthia Falls Sandstone Middle Jurassic Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200-m-thick. The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded bedding. The sandstone consistsThe sparse fauna includes the ammonites Chondroceras and Stephanoceras as well as the pelecypods Inoceramus sp. and Mytilus sp. SV004522 Seldovia Sedimentary 3183 Jtf Tuxedni Group, Fitz Creek Siltstone Middle Jurassic Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions. Interbedded are fine-grained sandstone and, locally, conglomerate interbeds. InThis unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods. A few non-diagnostic brachiopods are also present. The ammonites include Normannites, Teloceras, and Chondroceras and m KN005523 Kenai Sedimentary 3184 Jtf Tuxedni Group, Fitz Creek Siltstone Middle Jurassic Thick sequence of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions. Interbedded are fine-grained sandstone and, locally, conglomerate interbeds. InThis unit is abundantly fossiliferous and is the first unit of the Tuxedini Group where ammonites are more numerous than pelecypods. A few non-diagnostic brachiopods are also present. The ammonites include Normannites, Teloceras, and Chondroceras and m SV004523 Seldovia Sedimentary 3184 Jtg Tuxedni Group, Gaikema Sandstone Middle Jurassic Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding. Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia KN005524 Kenai Sedimentary 3185 Jtg Tuxedni Group, Gaikema Sandstone Middle Jurassic Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding. Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of red and green felsic volcanic rocks, aphanitic igneous rocks Fossiliferous throughout, containing pelcypods Meleagrinella, Trigonia, and Inoceramus and ammonites Witchellia(?), Stephanceras and locally, Sonninia (Papilliceras), Lissoceras, and Emileia SV004524 Seldovia Sedimentary 3185 Jtr Tuxedni Group, Red Glacier Formation Middle Jurassic Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone concentrated in the upper part of the unit and consisting of about 40 percent of the Formation. The siltstone is highly arenaceous and locally contains lenticular inThe Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit. Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya. Ammonites occur in two distinc KN005525 Kenai Sedimentary 3186 Jtr Tuxedni Group, Red Glacier Formation Middle Jurassic Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone concentrated in the upper part of the unit and consisting of about 40 percent of the Formation. The siltstone is highly arenaceous and locally contains lenticular inThe Red Glacier Formation is most abundantly fossiliferous in its upper parts, no fossils are known from the lower 2000 feet of the unit. Pelcypods include Meleagrinella, Trigonia, Inoceramus, Camptonectes, and Pleuromya. Ammonites occur in two distinc SV004525 Seldovia Sedimentary 3186 Jt Talkeetna Formation Early Jurassic (Hettangian to Toarcian) Mainly volcanic breccia, agglomerate, lava flows, and tuff. Sedimentary rocks locally interbedded but are minor. Informally divided into three members, which correlate with formal members elsewhere. Includes informally named Pogibshi Formation on east SV00267 Seldovia Igneous 3250 KJu Metasedimentary rocks (undivided) Cretaceous and (or) Jurassic Weakly metamorphosed slate and graywacke; locally includes volcanic and intrusive rocks, undivided. Consists of contact metamorposed Talkeetna Formation according to Detterman and others (1976, KN010). KN0022825 Kenai Metamorphic 3250 HFS Jtk Talkeetna Formation Early Jurassic Volcanic breccia, tuff, agglomerate, and aphanitic lava flows; as mapped, locally includes Kamishak Formation in Ilianna Quad KN0023250 Kenai Igneous 3250 bpT Jurassic bedrock Jurassic Volcanic flows, tuffs, and breccias, metamorphic equivalents, and granodiorite. Talkeetna Formation and other units KN006622 Kenai Igneous 3250 Jtku Talkeetna Formation, undivided Early Jurassic Tuff, sandstone, agglomerate, breccia and some lava flows KN005529 Kenai Igneous 3250 Jv Volcanic rocks Jurassic Volcanic rocks, locally includes sedimentary rocks KN009904 Kenai Igneous 3250 Jtku Talkeetna Formation, undivided Early Jurassic Tuff, sandstone, agglomerate, breccia and some lava flows SV004529 Seldovia Igneous 3250 Mz Metamorphic rocks Mesozoic Schist, hornfels, and amphibolite, contact metamorphosed Talkeetna Formation KN0101010 Kenai Metamorphic 3250 HFS sv Sedimentary and volcanic rocks Cenozoic and Mesozoic Cheifly Jurassic volcanic rocks; locally includes Mesozoic and Cenozoic sedimentary and volcanic rocks KN0121206 Kenai Sedimentary 3250 Jtkh Talkeetna Formation, Horn Mountain Tuff Member Early Jurassic Mottled andesitic tuff, tuffaceous sandstone, and siltstone, locally contains andesitic flows KN005526 Kenai Sedimentary 3251 Jtkp Talkeetna Formation, Portage Creek Agglomerate Member Early Jurassic Massive pink agglomerate and some volcanic breccia; minor andesitic flows, locally metasedimentary rock KN005527 Kenai Igneous 3252 Jtkm Talkeetna Formation, Marsh Creek Breccia Member Early Jurassic Massive green volcanic breccia, lava flows, in part of submarine origin, interbedded with argillite and meta tuff, low rank metamorphism mainly confined to lower part KN005528 Kenai Igneous 3253 Jt (east)Talkeetna Formation (Pogibshi Formation) Early Jurassic (Hettangian to Toarcian) Mainly volcanic breccia, agglomerate, lava flows, and tuff. Sedimentary rocks locally interbedded but are minor. Informally named Pogibshi Formation on east side of Cook Inlet SV00267 Seldovia Igneous 3265 Jth Trondjemite Jurassic Trondjemite KN0121204 Kenai Igneous 3380 Jg Granitic rocks Jurassic Granitic rocks of the Alaska-Aleutian Range batholith KN01111340Kenai Igneous 3400 Jgd Quartz monzonite Jurassic Quartz monzonite KN0023402 Kenai Igneous 3402 Jqm Quartz monzonite Jurassic Medium- to coarse-grained pink to gray granitic-textured quartz monzonite KN005532 Kenai Igneous 3402 Jqd Quartz diorite, diorite, and granodiorite Jurassic Quartz diorite, diorite, and granodiorite KN0023403 Kenai Igneous 3403 Jd Diorite of Point Bede Jurassic(?) Fine- to medium-grained nonfoliated quartz diorite. SV002111 Seldovia Igneous 3404 Jto Tonalite of Dogfish Bay Jurassic(?) Medium-grained nonfoliated tonalite. SV002116 Seldovia Igneous 3404 Jqd Quartz diorite Jurassic Mainly biotite-hornblende-quartz dioriite KN005533 Kenai Igneous 3404 di Quartz diroite dikes Jurassic Quartz diorite dikes KN005537 Kenai Igneous 3404 Ju Plutonic rocks, undivided Jurassic Plutonic rocks, undivided; chiefly tonalite and trondhjemite KN009903 Kenai Igneous 3404 JT Tonalite Jurassic Tonalite, includes hornblendite, hornblende-biotite quartz diorite, and rare granodiorite, quartz monzonite, and granite KN0121205 Kenai Igneous 3404 la Lamprophyre dikes Jurassic Lamprophyre dikes KN005534 Kenai Igneous 3420 Jsm Seldovia metamorphic complex Early Jurassic Marble, quartzite, garnet-mica schist, and glaucophane-bearing amphibolite 191.1 and 191.7 Ma Ar-Ar on white mica and 191.9 Ma Ar-Ar on hornblende SV00210 Seldovia Metamorphic 3610 JTrp Port Graham Formation of Kelley (1980) Early Jurassic and Late Triassic Dark-gray, carbonaceous limestone and silty limestone, also includes tuff, tuffaceous sedimentary rocks, and chert. Most of unit considered Norian in age. Bivalves of Late Triassic (Norian) age SV00260 Seldovia Sedimentary 4019 Trk Kamishak Formation Late Triassic Limestone, grey to black chert, and porcellanite KN0024020 Kenai Sedimentary 4020 J(?)f Felsite Jurassic(?) or early Tertiary(?) Fine-grained aphanitic, light gray felsite SV002115 Seldovia Igneous 4310 Jd Diorite of Point Bede Jurassic(?) Fine- to medium-grained nonfoliated quartz diorite. Newly determined zircon age of approx. 206 Ma SV008111 Seldovia Igneous 4310 Jto Tonalite of Dogfish Bay Jurassic(?) Medium-grained nonfoliated tonalite. Assigned new nsaclass based on date of Diorite of Point Bede by Dwight Bradley. SV008116 Seldovia Igneous 4310 Mg Gabbro Mesozoic Dark-green, medium- to coarse-grained gabbro and minor leucogabbro and plagiogranite. Associated with McHugh Complex as fault-bounded bodies. SV002112 Seldovia Igneous 4880 Mu Ultramafic plutonic rocks Mesozoic Predominantly layered, variably serpentinized dunite containing rare to locally abundant layers of chromitite and pyroxenite and fault slices of garnet pyroxenite and serpintinite. Associated with McHugh Complex as fault-bounded bodies. SV002110 Seldovia Igneous 4890 Trm Metamorphic rocks, undivided Late(?) Triassic Metalimestone, argillite, quartzite, metatuff, greenstone, and phyllite; may in part be equivalent to the Kamishak Formation KN005530 Kenai Metamorphic 5220 as Amphibolite Early Mesozoic(?) Amphibolite, locally includes sedimentary rocks KN009906 Kenai Metamorphic 5220