!NSACLASSNLABELCNAMECzAGEC=DESCRIPTIOCSYMBOLNOVERPRINTNSOURCESC 99 bu Bedrock unknown Areas of known or apparent bedrock exposures. Bedrock type unknown. In the Taylor Mountains quadrangle, a number of the areas shown as bedrock unknown are in areas mapped as largely Kuskokwim Group; however, on air-photos these areas appeared distincti7 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 100 Qs Surficial deposits, undivided Quaternary Unconsolidated, poorly to well-sorted, poorly to moderately well-stratified deposits; consist predominantly of alluvial, colluvial, glacial, marine, lacustrine, eolian, and swamp deposits. Also, locally includes reworked volcanic debris as well as block20 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 275 Qsb Scoured bedrock Quaternary? Areas of glacially scoured unexposed bedrock covered by a thin(?) mantle of unconsolidated surficial deposits; air-photo interpretation. Where shown, bedrock type is indeterminate from available data 10 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 300 Qv Volcanic rocks, undivided Quaternary Andesite, dacite, and basalt lava flows, volcanic breccia, lahar deposits, and debris-flow deposits. Includes air-fall tuff, volcanic dome deposits, block-and-ash-flow deposits, ash-flow tuffs, volcanic-rubble flows, debris flows and hot-blast avalanche12 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 305 Hv Volcanic rocks Quaternary, Holocene Andesite and basalt lava flows, and sills. These primarily extrusive rocks typically form the present day edifices of Iliamna and Redoubt Volcanoes. They cap ridges and include massive lava flows, agglomerate, and lahar deposits, primarily associated w78 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 310 Qv Volcanic rocks, undivided Quaternary Andesite, dacite, and basalt lava flows, volcanic breccia, lahar deposits, and debris-flow deposits. Includes air-fall tuff, volcanic dome deposits, block-and-ash-flow deposits, ash-flow tuffs, volcanic-rubble flows, debris flows and hot-blast avalanche12 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 311 Qv Volcanic rocks, undivided Quaternary Andesite, dacite, and basalt lava flows, volcanic breccia, lahar deposits, and debris-flow deposits. Includes air-fall tuff, volcanic dome deposits, block-and-ash-flow deposits, ash-flow tuffs, volcanic-rubble flows, debris flows and hot-blast avalanche12 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 312 Qdf Debris-flow deposits Quaternary, Holocene Debris flow deposits from Redoubt Volcano in the Crescent River valley. Includes several small (older?) deposits in the upper valley and a 3,500-year-old debris flow in the lower valley. The older deposits are of multiple debris flows off the west and 12 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 313 Qmf Volcanic rubble and mudflows Quaternary, Holocene Volcanic rubble and mudflows on Augustine Volcano (Detterman and Reed, 1980) as well as mudflows in the Drift River valley draining Redoubt Volcano (Till and others, 1993) these deposits are of Holocene age and many are historic including 1963 mudflows 12 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 314 Qmf Volcanic rubble and mudflows Quaternary, Holocene Volcanic rubble and mudflows on Augustine Volcano (Detterman and Reed, 1980) as well as mudflows in the Drift River valley draining Redoubt Volcano (Till and others, 1993) these deposits are of Holocene age and many are historic including 1963 mudflows 12 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 384 Jtf Tuxedni Group, Fitz Creek Siltstone Middle Jurassic, middle Bajocian Thick sequence (up to 400 m thick) of massive, bluish dark-gray, arenaceous coarse- to fine-grained siltstone that commonly weathers rusty orange and contains many small limestone concretions (Detterman and Hartsock, 1966). Interbedded is fine-grained s Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 402 Qamp Andesite and dacite domes Quaternary Composite dome complex of Double Glacier Volcano consisting of medium- to coarsely porphyritic hornblende andesite and dacite. Three K-Ar whole-rock ages were determined on these domes, two are considered minimum ages at 627 and 763 ka and one yielded 876 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 450 QTv Volcanic rocks, undivided Quaternary, Pleistocene or Tertiary, Pliocene Detterman and Reed (1980) mapped two eruptive centers within the Jurassic part of the Alaska-Aleutian Range batholith in the Iliamna quadrangle. Only one of the sites was examined and that only briefly by Detterman and Reed (1980). Scoriaceous olivine 410 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 460 QTv Volcanic rocks, undivided Quaternary, Pleistocene or Tertiary, Pliocene Detterman and Reed (1980) mapped two eruptive centers within the Jurassic part of the Alaska-Aleutian Range batholith in the Iliamna quadrangle. Only one of the sites was examined and that only briefly by Detterman and Reed (1980). Scoriaceous olivine 410 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 500 Ts Sedimentary rocks Tertiary, Pliocene or Miocene Consists mainly light- to medium-gray and light-tan, fine- to medium-grained tuffaceous feldspathic to arkosic wacke and siltstone containing scattered pebbles and lenticular beds of pebble conglomerate (Detterman and Reed, 1980). Micaceous clay and sil88 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 630 Ttyh Kenai Group, Tyonek Formation and Hemlock Conglomerate undivided Tertiary, Miocene and Oligocene Sandstone, conglomerate, and siltstone. Known within the map area only in the vicinity of Harriet Point in the Kenai quadrangle, these rocks are inferred from the description in Detterman and others (1976) to consist of fluvial conglomeratic sandstone a81 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 850 Tcl Copper Lake Formation, undivided Tertiary, Eocene and Paleocene? Thick clastic nonmarine sedimentary rock unit consisting of an upper and lower conglomerate member bounding a middle sandstone and siltstone member (Detterman and Reed, 1980; Detterman and others, 1996) at the east end of Lake Iliamna. Upper conglomerat135 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 855 Twf West Foreland Formation Tertiary, Eocene Tan to light-yellow-brown cobble conglomerate interbedded with lesser sandstone, laminated siltstone, and silty shale (Detterman and Hartsock, 1966). Thin coal beds are interbedded with the siltstone and shale. The clasts in the conglomerate are mainly90 14 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1000Tvu Volcanic rocks, undivided Tertiary Andesite, basalt, and dacite lava flows, tuff, lahar deposits, volcanic breccia, and hypabyssal intrusions. Widely scattered throughout the map area, they are most apparent in the Lake Clark quadrangle where they are a subdivision of the Tvf map unit of301 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1001Tvr Felsic volcanic rocks Tertiary Rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic and intermediate flows. Unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Formation. Much of this unit was included in map uni30113 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1003Tvu Volcanic rocks, undivided Tertiary Andesite, basalt, and dacite lava flows, tuff, lahar deposits, volcanic breccia, and hypabyssal intrusions. Widely scattered throughout the map area, they are most apparent in the Lake Clark quadrangle where they are a subdivision of the Tvf map unit of301 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1011Tvr Felsic volcanic rocks Tertiary Rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic and intermediate flows. Unit is thought to encompass entire Tertiary and may include Jurassic rocks of the Talkeetna Formation. Much of this unit was included in map uni30113 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1025Tb Basaltic volcanic rocks Late Tertiary Olivine basalt lava flows as much as 10 m thick and locally diabasic intrusive rocks in the northwest corner of the Taylor Mountains quadrangle. These columnar-jointed flows, which form a large tilted plateau, yielded K-Ar ages of 4.62 and 4.72 Ma (Reif30114 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1030Tpg Gibraltar Lake Tuff Tertiary, Pliocene? to Oligocene? Defined by Detterman and Reed (1980), it is divided into a lower welded member and an upper nonwelded member. The upper member consists of light-gray to white crystal ash-flow tuff having a maximum thickness of 152 to 182 m. It is locally capped by bas30115 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1031Tpg Gibraltar Lake Tuff Tertiary, Pliocene? to Oligocene? Defined by Detterman and Reed (1980), it is divided into a lower welded member and an upper nonwelded member. The upper member consists of light-gray to white crystal ash-flow tuff having a maximum thickness of 152 to 182 m. It is locally capped by bas30115 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1070Tmf Tuffaceous felsic volcanic rocks Tertiary, Oligocene and Eocene Cream, light-gray, green, and purple bedded lithic, crystal, and vitric tuff; light-gray to tan welded crystal and lithic tuff most common (Detterman and Reed, 1980). Also includes distinctive light colored horizons of felsic tuff interlayered with oliv413 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1081Tmv Volcanic rocks, undivided Tertiary, Oligocene and Eocene Ranges from rhyolitic breccia, ash-flow tuff, and flows to dark-gray to green, coarse andesitic and basaltic volcanic rubble, lahar deposits, glassy to porphyritic basaltic andesite and andesite lava flows. Includes minor volcaniclastic sedimentary rock416 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1082Tmba Basalt and andesite Tertiary, Oligocene and Eocene Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows. Also includes andesite to basalt plugs, volcanic rubble and breccia, including some agglomerate; may include deposits of lahars (Detterman and Reed, 1980). Includes two41613 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1084Tmba Basalt and andesite Tertiary, Oligocene and Eocene Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows. Also includes andesite to basalt plugs, volcanic rubble and breccia, including some agglomerate; may include deposits of lahars (Detterman and Reed, 1980). Includes two41613 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1087Tmba Basalt and andesite Tertiary, Oligocene and Eocene Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows. Also includes andesite to basalt plugs, volcanic rubble and breccia, including some agglomerate; may include deposits of lahars (Detterman and Reed, 1980). Includes two41613 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1111Tmba Basalt and andesite Tertiary, Oligocene and Eocene Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows. Also includes andesite to basalt plugs, volcanic rubble and breccia, including some agglomerate; may include deposits of lahars (Detterman and Reed, 1980). Includes two41613 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1112Tmf Tuffaceous felsic volcanic rocks Tertiary, Oligocene and Eocene Cream, light-gray, green, and purple bedded lithic, crystal, and vitric tuff; light-gray to tan welded crystal and lithic tuff most common (Detterman and Reed, 1980). Also includes distinctive light colored horizons of felsic tuff interlayered with oliv413 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1125Tmba Basalt and andesite Tertiary, Oligocene and Eocene Dark-gray to green glassy to porphyritic basaltic andesite and andesite lava flows. Also includes andesite to basalt plugs, volcanic rubble and breccia, including some agglomerate; may include deposits of lahars (Detterman and Reed, 1980). Includes two41613 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1130Tvig Ignimbrite Tertiary, Paleocene Crystal tuff containing variable amounts of biotite and feldspar crystals in a tuffaceous matrix (Wilson and others, 2003). Unit is widespread in the Stuyahok Hills in the northeast Dillingham quadrangle and varies in general appearance from crystal tuf3620 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1203Tig Granite and aplite Tertiary, Oligocene? and younger This map unit includes a variety of granite bodies in the Lake Clark quadrangle (Nelson and others, 1983). A multiphase, hypabyssal leucocratic grayish-pink biotite granite outcropping north of the Lake Clark fault system (Ti13 of Nelson and others, 19817413 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1205Ti Intrusive rocks, undivided Tertiary Generally consists of fine- to medium-grained granodiorite and quartz diorite, but also includes granite (Nelson and others, 1983). Typically surrounded by well-developed hornfels zones and sporadic hydrothermal alteration in country rocks, includes vol174 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1275Togd Granodiorite and quartz monzodiorite Tertiary, Oligocene and late Eocene A compositionally variable suite of medium-grained, slightly foliated rocks ranging from tonalite to monzodiorite, including quartz diorite and granodiorite (Detterman and Reed, 1980; Nelson and others, 1983). Also, heterogeneous, intensely sheared and 17414 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1300Teg Granite Tertiary, late Eocene Largely granite, but includes lesser granodiorite and quartz monzodiorite (Nelson and others, 1983). This map unit includes a large biotite granite, biotite-hornblende granite and granodiorite pluton in the northeast part of the Lake Clark quadrangle wh126 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1320Tipg Older granite Tertiary, Paleocene Medium-grained composite pluton of granite and granodiorite which forms western border of Alaska-Aleutian Range batholith from Little Lake Clark southwestward into the Iliamna quadrangle. Age inferred; however, a single K-Ar age (Reed and Lanphere, 197223613 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1325Tpgr Peralkaline granite Tertiary Mostly medium-grained hypidiomorphic granular granite containing subhedral to euhedral perthite (Nelson and others, 1983). Only peralkaline granite associated with Alaska-Aleutian Range batholith and probably not related to calc-alkaline rocks of the ba23616 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1350Tigd Granodiorite Tertiary, Paleocene Medium- to fine-grained, equigranular hornblende-biotite granodiorite plutons, but ranges from granite to quartz monzodiorite (Nelson and others, 1983). Intrudes Jurassic and Cretaceous rocks of Alaska-Aleutian Range batholith. Concordant K-Ar ages of 17214 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1380Tign Gabbronorite Tertiary Small, coarse-grained stock of hornblende and biotite-bearing olivine gabbronorite cutting Mesozoic sedimentary rocks (Nelson and others, 1983). According to Nelson and others, this pluton is most likely related to nearby Tertiary volcanic rocks Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1600TKv Volcanic rocks Tertiary and [or] Cretaceous Volcanic rocks including tuff, tuff breccia, and breccia. Compositional as well as age data is not available for these rocks (Eakins and others, 1978, W.K. Wallace, written commun., 2002). Subdivided 303 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1602TKr Rhyolite and dacite flows, tuff, dikes, and sills Tertiary and [or] Cretaceous Rhyolite and dacite flows and tuff cut by dikes or sills which locally contain phenocrysts of sanidine and high temperature quartz. These rocks primarily occur in the valley of the Mulchatna River in the Lake Clark quadrangle spatially associated with r30313 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1603TKr Rhyolite and dacite flows, tuff, dikes, and sills Tertiary and [or] Cretaceous Rhyolite and dacite flows and tuff cut by dikes or sills which locally contain phenocrysts of sanidine and high temperature quartz. These rocks primarily occur in the valley of the Mulchatna River in the Lake Clark quadrangle spatially associated with r30313 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1604TKr Rhyolite and dacite flows, tuff, dikes, and sills Tertiary and [or] Cretaceous Rhyolite and dacite flows and tuff cut by dikes or sills which locally contain phenocrysts of sanidine and high temperature quartz. These rocks primarily occur in the valley of the Mulchatna River in the Lake Clark quadrangle spatially associated with r30313 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1635TKb Basalt flows Tertiary and [or] Cretaceous Scattered occurrences west of Lark Clark. No further lithologic description available (Eakins and others, 1978). Thrupp (1987) reported 2 K-Ar dates from this map unit, both whole-rock K-Ar determinations. One was 44.4 1.7 and the other 65.8 13.2 30314 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1655TKg Granitic rocks, undivided Tertiary and [or] Cretaceous Fine-, medium-, and coarse-grained, light- to dark-gray, rarely pink granitic rocks widely present west of the Alaska-Aleutian Range crest. Chiefly granite, quartz monzonite, and quartz monzodiorite; however, many of the individual plutons include a ran244 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1656TKgr Granite and alaskite Tertiary and [or] Cretaceous Ranging from very leucocratic alaskite to highly potassic, peralkaline monzogranite, the rocks of this unit are widely distributed in the map area. In the Dillingham quadrangle (Wilson and others, 2003), a large (7 km in diameter) coarse- to fine-graine24413 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1657TKgs Syenitic rocks Tertiary and [or] Cretaceous Medium-grained biotite monzogranite to syenogranite found in the mountains immediately south of the Koktuli River (Wilson and others, 2003). Biotite is the only mafic mineral and orthoclase has moderate development of string perthite. SiO2 of analyzed 24116 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1658TKqm Quartz monzonite and quartz monzodiorite Tertiary and [or] Cretaceous Medium- to coarse-grained, light-gray monzogranite or quartz monzodiorite, may contain biotite, hornblende, sodic amphibole, and (or) clino- and orthopyroxene. Locally contain large phenocrysts of orthoclase; biotite to hornblende ratio is variable but 241 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1660TKgd Granodiorite Tertiary and or Cretaceous Medium-grained, hypidiomorphic granular, seriate granodiorite. Biotite tends to more abundant than hornblende. Common in the Lake Clark and Kenai quadrangles (Reed and Lanphere (1972, 1973, Magoon and others, 1976, Detterman and others, 1976). K-Ar ag24414 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1665TKqd Monzodiorite and quartz diorite Tertiary and [or] Cretaceous Generally located in the central Lake Clark quadrangle and northeast Dillingham quadrangle, these plutons are largely fine- to medium-grained monzodioritic and dioritic rocks, but locally include diorite and gabbro. Rocks typically have sparse biotite a325 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1955Kkg Kaguyak Formation Upper Cretaceous, Maestrichtian and Campanian Consists of a measured thickness of more than 1,200 m of dark-gray to pale-brown, typically thin-bedded, shale, siltstone, and fine-grained sandstone Detterman and others, 1996). However, only a small area of outcrop occurs within the map area on the so742 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1961Ksm Saddle Mountain section of Magoon and others (1980) Cretaceous, Maestrichtian Nonmarine sandstone, conglomerate, and minor siltstone and coal found in the northeast of Chinitna Bay in a section 83 m thick (Magoon and others, 1980). Consists dominantly of fine- to medium-grained sandstone that fines upward and is generally massive745 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1970Kk Kuskokwim Group, undivided Cretaceous, Campanian? to Albian? Sandstone, siltstone, shale, and conglomerate (Cady and others, 1955). Sandstone is fine- to medium-grained, commonly micaceous gray graywacke or silty graywacke which is occasionally crossbedded, or contains siltstone partings. Rare argillite pebbles.752 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 1985Kkn Kuskokwim Group, nearshore facies Cretaceous Sandstone, siltstone, shale, and conglomerate as mapped by J.N. Platt (1957, unpub. data) in the northeastern Taylor Mountains quadrangle. This informal sub-division of the Kuskokwim Group was originally defined by J.N. Platt (1957, unpub. data). Mille75216 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2260Kkv Kuskokwim Group?, volcanogenic rocks Cretaceous? Volcanogenic sedimentary rocks and tuff. Contains some cherty argillite, minor limestone, and locally, dikes. Unit defined on the basis of field notes of J.M. Hoare and W.H. Condon (U.S. Geological Survey, 1969 and 1970). Unit occurs in the northweste40 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2410Kg Plutonic rocks, undivided Cretaceous No description available beyond granodiorite, quartz diorite, and diorite (Magoon and others, 1976; Reed and others, 1992), but assumed to include representatives of the Cretaceous granitic rocks described below. Primarily located in the northeast part 270 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2420Kgd Granodiorite Cretaceous Granodiorite and quartz monzodiorite bodies mapped by Nelson and others (1983) in the eastern Lake Clark quadrangle, as well as plutons surrounding the Pebble Copper deposit (Bouley and others, 1995) in the Iliamna quadrangle. The rocks are medium- to c27014 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2430Kqd Quartz diorite Cretaceous Locally foliated, largely medium-grained hornblende-biotite quartz diorite, but includes hornblende-pyroxene gabbro and diorite, quartz diorite, tonalite, and minor granodiorite (Nelson and others, 1983). Occurs only in the Lake Clark quadrangle. Reed 672 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2460Kgr Granite Cretaceous Coarse-grained, light-pink, biotite granite (Detterman and Reed, 1980, Nelson and others, 1993). Exposed on the southern margin of the Lake Clark quadrangle and northern Iliamna quadrangle. No age control available 27013 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2470Kqms Quartz monzonite and syenite Late Cretaceous Massive, coarse-grained light-gray porphyritic quartz monzonite (Detterman and Reed, 1980, Nelson and others, 1993). Includes plutons in the Iliamna and Lake Clark quadrangles and the pluton of the Okstukuk Hills in the Dillingham quadrangle (Wilson, 1927016 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2480Klgd Granodiorite Late Cretaceous Isolated porphyritic granodiorite body having phenocrysts of quartz, plagioclase, biotite, and glomeroporphyritic clusters of pale-green amphibole in a groundmass of quartz and mostly potassic feldspar in the southcentral Lake Clark quadrangle (Nelson an27914 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2830KTrag Togiak-Tikchik Complex - Argillite and graywacke Lower Cretaceous to Upper Triassic Gray to gray-green argillite, cherty argillite, graywacke, and minor mudstone, tuffaceous sandstone, and chert. Unit description is largely derived from the field notes and field maps of J.M. Hoare, W.H. Condon (1969-1970), and W.M. Cady (1943-1944). T912 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2831KTragiTogiak-Tikchik Complex - Argillite and graywacke, cut by dike swarms Cretaceous to Triassic Rocks of map unit KTrag and possibly other map units apparently cut by felsic dike swarms or shallow intrusions. Host rocks are primarily calcareous argillic graywacke and cherty argillite 91213 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2855KJkr Koksetna River sequence of Wallace and others (1989) Lower Cretaceous, Valanginian to Upper Jurassic, KimmeridgianComplexly deformed volcanic-lithic turbidites. Consists of a thick monotonous sequence of thin sandstone (<4 cm) beds interbedded with pelagic shale. Locally fining upward sequences of sandstone beds reach thicknesses of 1.5 m and have scoured bases an80013 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2870KJv Olivine basalt and fragmental volcanic rocks Cretaceous or Jurassic Olivine basalt flows and fragmental mafic volcanic rocks. Apparent range in composition is from andesite to basalt. Unit is contact metamorphosed by nearby Late Cretaceous and early Tertiary plutonism. Part of unit KJvs volcanic and sedimentary rocks;668 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2872KJvs Volcanic and sedimentary rocks Lower Cretaceous to Middle Jurassic Thick marine unit consisting of low-grade metamorphic or contact metamorphosed volcanic and sedimentary rocks (Hoare and Coonrad, 1978). This rock unit was mapped by Hoare and Coonrad (1978) in the western Dillingham and adjacent Goodnews Bay quadrangle79013 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 2900KJg Mafic granitic rocks Cretaceous and (or) Jurassic Medium-gray, medium-grained, hypidiomorphic granular hornblende-biotite quartz monzodiorite containing variable amounts of clinopyroxene. Flow structures locally present and hornblende and plagioclase is aligned in a north-northeast direction. Two samp248 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3010Jn Naknek Formation Upper Jurassic; Tithonian to Oxfordian Originally named Naknek Series by Spurr (1900, p. 169-171, 179, 181) for exposures at Naknek Lake on the Alaska Peninsula. Largely consists of sandstone, conglomerate and siltstone having a primarily plutonic provenance. This rock unit is widespread in844 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3012Jnn Naknek Formation, Northeast Creek Sandstone Member Upper Jurassic; Oxfordian Arkosic sandstone and graywacke. Called the "lower sandstone member" by Detterman and Hartsock (1966), they considered this unit to have only local significance. Later work on the Alaska Peninsula (Detterman and others, 1996) showed that the lateral eq84414 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3013Jnst Naknek Formation, Snug Harbor Siltstone Member Upper Jurassic; Kimmeridgian and Oxfordian Dominantly massive to thin-bedded, dark-gray to black siltstone; calcareous gray sandstone beds are minor part of the unit (Detterman and Hartsock, 1966). Hard gray limestone concretions and lenses are locally abundant; rare thin layers of volcanic ash 83815 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3014Jnp Naknek Formation, Pomeroy Arkose Member Upper Jurassic; Kimmeridgian Massive light-gray, medium- to coarse-grained arkose containing many interbedded thin beds of dark-gray to brownish siltstone and pebble conglomerate (Detterman and Hartsock, 1966). The sandstone is rich in quartz (40-45 percent) and sodic feldspar (30-84413 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3016Jnc Naknek Formation, Chisik Conglomerate Member Upper Jurassic Consists of massive to thick-bedded conglomerate and interbedded, crossbedded, quartzose sandstone. Clasts, as large as 2 m, are mainly granitic rocks, but up to 20 percent metamorphic and volcanic rocks are present (Detterman and others, 1996). The un83816 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3020Jcp Chinitna Formation, Paveloff Siltstone Member Middle Jurassic, Callovian Consists of massive dark-gray arenaceous siltstone in the upper part and a thick sandstone unit at its base (Detterman and Hartsock, 1966). Large ellipsoidal concretions and lenticular beds of limestone occur throughout the unit and thin interbeds of sa97113 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3030Jct Chinitna Formation, Tonnie Siltstone Member Middle Jurassic, Callovian Massive dark-gray to brownish-gray arenaceous siltstone, which weathers brownish-gray to red-brown (Detterman and Hartsock, 1966). Numerous small yellowish-brown weathering limestone concretions occur in parallel bands and randomly throughout the sectio97114 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3150Jkw Graywacke of Kulukak Bay Middle to Upper Jurassic A thick marine sedimentary unit consisting of very hard dark-green or gray, massive graywacke and siltstone containing local conglomerate horizons. Typically consists of sandstone, although coarse pebble conglomerate is locally present. According to Ho800 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3180Jt Tuxedni Group Middle Jurassic, Bathonian to Bajocian Light- to dark-gray and green graywacke, conglomerate, siltstone, and shale (Detterman and Hartsock, 1966). Graywacke ranges from feldspathic to lithic, conglomerate composed mainly of volcanic clasts in a graywacke matrix. Unit is locally subdivided i999 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3181Jtb Tuxedni Group, Bowser Formation Middle Jurassic, Callovian and Bathonian Heterogeneous assemblage of sandstone, conglomerate, shale and siltstone characterized by rapid facies changes (Detterman and Hartsock, 1966). Massive light- to dark-gray sandstone and conglomerate are the dominant lithologic types on the Iniskin Penins99913 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3182Jtt Tuxedni Group, Twist Creek Siltstone Middle Jurassic, Bajocian Soft, poorly consolidated, thin-bedded to massive siltstone and silty shale as much 125 m thick (Detterman and Hartsock, 1966). The siltstone is dark-gray, weathering to dark-rusty brown and contains many thin beds of volcanic ash that weather a bright 37 13 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3183Jtc Tuxedni Group, Cynthia Falls Sandstone Middle Jurassic, Bajocian? Massive to thick-bedded graywacke sandstone and pebble conglomerate about 200 m thick (Detterman and Hartsock, 1966). The sandstone is medium- to coarse-grained, greenish-gray to dark-green, weathering mottled light-gray due to zeolites and has graded b99914 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3185Jtg Tuxedni Group, Gaikema Sandstone Middle Jurassic, lower middle Bajocian Resistant, cliff-forming, massive to thin-bedded graywacke sandstone and cobble conglomerate showing graded bedding 150- to 260 m thick (Detterman and Hartsock, 1966). Conglomerate is confined to the Iniskin Peninsula, clasts in it consist of "red and g99915 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3186Jtrg Tuxedni Group, Red Glacier Formation Middle Jurassic, lower Bajocian to lower middle Bajocian Thin-bedded to massive, red-brown weathering dark-gray to moderate olive-gray siltstone is concentrated in the upper part of the unit and makes up about 40 percent of the Formation (Detterman and Hartsock, 1966). The siltstone is highly arenaceous and l37 15 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3220Jms Togiak-Tikchik Complex - Sedimentary rocks Lower Jurassic Marine unit of micaceous, fine-grained black graywacke, siltstone, and slate, and gritty limestone. Contains Weyla pelecypods of Early Jurassic age. Cropping out along the Allen River area near where it drains into Lake Chauekuktuli, these rocks occur 34 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3250Jtk Talkeetna Formation, undivided Lower Jurassic Bedded volcanic rocks widely distributed in the Iliamna, Lake Clark and Kenai quadrangles. Where undivided, it consists of flows, breccia, tuff, and agglomerate and minor sandstone and shale, often somewhat altered or metamorphosed (Detterman and Harts707 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3251Jtkh Talkeetna Formation, Horn Mountain Tuff Member Lower Jurassic Bedded tuff and tuffaceous feldspathic sandstone, locally containing porphyritic andesite flows. Bedded tuff occurs in thin-bedded to massive beds that are fine- to coarse-grained, and tan, red, green, purple, or mottled (Detterman and Hartsock, 1966). 7040 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3252Jtkp Talkeetna Formation, Portage Creek Agglomerate Member Lower Jurassic Reddish fragmental volcanic debris, primarily rounded volcanic bomb-like fragments and lapilli tuff (Detterman and Hartsock, 1966). In contrast to the Marsh Creek Breccia Member, this unit grades to fine-grained tuff, clastic sedimentary rocks and flows70713 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3253Jtkm Talkeetna Formation, Marsh Creek Breccia Member Lower Jurassic Massive dark-green to green volcanic breccia having a tuff matrix (Detterman and Hartsock, 1966). Consists of angular fragments of aphanitic pink and green volcanic rocks ranging in size from 1 cm to nearly 1 m. Interbedded flows of andesite and basalt70413 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3260JTrp Togiak-Tikchik Complex - Phyllite and chert Lower Jurassic and Upper Triassic? Gray to black cherty phyllitic shale, highly contorted thin-bedded siliceous argillite and local cherty dark calcareous phyllite outcropping along the western margin of the Taylor Mountains quadrangle in association with greenstone of map unit MDv. The 790 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3380Jtr Alaska-Aleutian Range batholith, Trondhjemite Late Jurassic Medium- to coarse-grained, seriate, leucocratic trondhjemite containing 10 percent muscovite and about 5 percent interstitial, perthitic potassium feldspar. This is a large body in the central part of the batholith west of Chinitna Bay. A single K-Ar a129 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3402Jqm Alaska-Aleutian Range batholith, Granodiorite and quartz monzonite Jurassic Whitish-gray, medium-grained, biotite granodiorite, minor hornblende and accessory primary muscovite. Medium-grained, light-gray with a pinkish cast quartz monzonite, locally may include quartz diorite and trondhjemite. This unit is largely exposed on42314 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3403Jqd Alaska-Aleutian Range batholith, Quartz diorite, tonalite, and diorite Jurassic Medium-grained quartz diorite and tonalite, which are locally foliated. This is by far the dominant map unit of the Alaska-Aleutian Range batholith. Hornblende is the dominant mafic mineral, biotite increases in proportion to the presence of quartz and423 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3404Jqd Alaska-Aleutian Range batholith, Quartz diorite, tonalite, and diorite Jurassic Medium-grained quartz diorite and tonalite, which are locally foliated. This is by far the dominant map unit of the Alaska-Aleutian Range batholith. Hornblende is the dominant mafic mineral, biotite increases in proportion to the presence of quartz and423 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3405Jqd Alaska-Aleutian Range batholith, Quartz diorite, tonalite, and diorite Jurassic Medium-grained quartz diorite and tonalite, which are locally foliated. This is by far the dominant map unit of the Alaska-Aleutian Range batholith. Hornblende is the dominant mafic mineral, biotite increases in proportion to the presence of quartz and423 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3420Jla Alaska-Aleutian Range batholith, Lamprophyre and basalt dikes Jurassic Shown only locally in the join area between the Iliamna and Kenai quadrangles (Detterman and Hartsock, 1966) these dikes intrude map unit Jqd 464 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3450Mzmi Mafic igneous rocks Mesozoic? Predominantly diabase, probably intrusive. Isolated outcrops in the north-central Dillingham quadrangle. Intrudes rocks provisionally assigned to map unit KTrag, suggesting age may be Triassic or younger. Volcanic rock outcrops to the northeast within312 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3495Jmu Alaska-Aleutian Range batholith, Mafic and ultramafic plutonic rocks Early Jurassic Small areas of gabbro, hornblende gabbro, hornblendite, and pyroxenite in the Jurassic batholith Detterman and Reed (1980). K-Ar ages of 160 and 183 Ma reported (Reed and Lanphere, 1972) 633 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 3821Jssc Chert, sandstone, and siltstone Lower Jurassic Medium-gray to yellowish-gray weathering, medium to thick-bedded, dominantly chert and sandstone unit with locally abundant phosphatic nodules developed in more cherty phases (R.B. Blodgett, 2005, unpub. data). These rocks are exposed along the peripher912 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4011Trcg Togiak-Tikchik Complex - Triassic limestone Triassic Marine unit consisting of chert, tuffaceous cherty rocks, argillite, siltstone, volcanic wacke, conglomerate, limestone, and mafic flows and breccias. Limestone is generally white to cream colored and recrystallized, however locally it is dark gray and 573708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4012Trlc Limestone, silty limestone, and chert Upper Triassic - Norian Cream colored to dark-gray, limestone, silty limestone and chert. Divisible into two subunits: (1) a lower subunit of massive- to thick-bedded, light-gray to cream colored limestone with common scleractinian corals, spongiomorphs, and lesser brachiopod749708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4020Trk Kamishak Formation, undivided Upper Triassic; Norian Limestone, chert, porcellanite, and minor tuff divided into three formal members, in descending order, the Ursus, Middle, and Bruin Limestone Members by Detterman and Reed (1980). Originally named the Kamishak Chert by Martin and Katz (1912) and renamed91216 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4022Trku Kamishak Formation, Ursus Member Upper Triassic; Norian Thin-bedded, light-gray limestone, locally dolomitic, and minor interbedded gray chert and porcellanite and minor tuff. Limestone is fine-grained biomicrite. Depositional environment was moderate to high-energy, shallow water 912708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4023Trkm Kamishak Formation, Middle Member Upper Triassic; Norian Thin- to medium-bedded, dark-gray to black limestone and calcilutite, locally dolomitic, and minor black chert and gray tuff. Limestone is fine-grained microsparite. Calcite is locally altered to chert, suggesting a deep-basin environment 905 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4024Trkb Kamishak Formation, Bruin Limestone Member Upper Triassic; Norian Massive to thin-bedded, light- to dark-gray limestone; coral and echinoid bioherms, banded green and white chert. Environment was apparently high energy, shallow water 90515 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4035Trcg Togiak-Tikchik Complex - Triassic limestone Triassic Marine unit consisting of chert, tuffaceous cherty rocks, argillite, siltstone, volcanic wacke, conglomerate, limestone, and mafic flows and breccias. Limestone is generally white to cream colored and recrystallized, however locally it is dark gray and 573708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4050Trsh Gray shale and gray volcaniclastic sandstone Upper Triassic Gray shale and gray volcaniclastic sandstone. Unit shown by Eakins and others (1978) in central Lake Clark quadrangle in close proximity to outcrops of the Chilikadrotna Greenstone. Originally thought to be of Silurian age on the basis of an erroneous 577 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4215Trv Togiak-Tikchik Complex - Volcanic rocks Upper Triassic Volcanic rocks comprising at least 5 separate flows, locally as much as 200 feet think interbedded with cherty siltstone. Associated with sparsely distributed Triassic limestone in the Cinnabar Creek area which yielded Monotis and Halobia fossils of La666 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4425Trc Cottonwood Bay Greenstone and Chilikradrotna Greenstone Triassic Largely dark-gray to dark-green porphyritic to amygdaloidal basaltic flows altered to greenstone (Detterman and Reed, 1980; Nelson and others, 1983; Wallace and others, 1989). Locally includes andesite, chert, limestone, and tuffaceous sedimentary rock,633 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 4950Mzm Togiak-Tikchik Complex - Melange Mesozoic? Located in the southwest Taylor Mountains and northwest Dillingham quadrangles, this unit consists of two or more rock types in close proximity, typically tightly folded, sheared, and/or altered, including pillowed and massive basalt, chert, gabbro, gray334 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5200MzPzu Metamorphic rocks, undivided Mesozoic and (or) Paleozoic Biotite-feldspar-quartz schist, locally actinolite-feldspar-quartz schist or garnet-feldspar-quartz schist (Eakins and others, 1978). Unit occurs west of Lake Clark 133 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5220JPk Kakhonak and Tlikakila Complexes Jurassic, Triassic, and Permian(?) or older(?) The Kakhonak Complex, defined by Detterman and Reed (1980), and the Tlikakila Complex, defined by Carlson and Wallace (1983), are lithologically diverse and complex assemblages of metamorphosed mafic plutonic, volcanic, and sedimentary rocks. Detterman 772348Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5240MzPzb Metamorphosed mafic volcanic and sedimentary rocks Mesozoic and (or) Paleozoic Metamorphosed mafic volcanic rocks, phyllite, schist, quartzite, marble, calc-silicate rocks, serpentinite, gabbro, and chert (Nelson and others, 1983). Mixed unit of varying affinity, protolith, and metamorphic age. Dominant rock type of unit is metam77213 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5380Pzc Togiak-Tikchik Complex - Black chert lower Paleozoic? Predominantly black and gray chert, but also includes rare white, buff, red, or green bedded to massive chert. Occasionally vitreous, banded, or fractured. Interbedded or structurally interleaved with minor amounts of limestone, amygdaloidal basalt, an34313 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5730Pls Togiak-Tikchik Complex - Limestone Permian Lenses of thin-bedded to massive, light- to dark-gray limestone either interbedded or intercalated with clastic and volcanic rocks in the vicinity of the Tikchik and Wood River lakes. Locally is gritty conglomeratic, contains siliceous interbeds, or has506708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5745Pcs Togiak-Tikchik Complex - Clastic rocks Permian? Fine to coarse-grained, locally conglomeratic or brecciated, light gray, greenish-gray, or black streaky, slaty, phyllitic, micaceous or silty bedded to massive graywacke. Cigar sized and shaped pits, boudins, or slightly contact metamorphosed in some a512 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 5810Pv Togiak-Tikchik Complex - Volcanic rocks Permian? Predominantly dark-green to black, altered mafic volcanic rocks having abundant amygdules. Volcanic breccia, calcareous tuff, and pillow lava constitute lower beds, pillow lavas in middle, and phyllitic calcareous tuff and tuffaceous limestone constitut339 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 6080TrPzrcTogiak-Tikchik Complex - Rainbow chert Triassic? to Paleozoic? Mostly highly deformed white, gray, red, minor green, or black, thin-bedded to massive, chert. Locally banded or brecciated and interbedded with minor red siliceous shale, argillite, dolomitic limestone, graywacke, and rare red volcanic rocks and agglom468 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 6412MDv Togiak-Tikchik Complex - Greenstone and schist Mississippian? and (or) Devonian? Fine- to coarse-grained, massive green to purple altered greenstone, occasionally calcareous or schistose, rarely interbedded with green chert, argillite, and tuff. Greenschist with occasional chert boudins is a minor part of unit as is shale-chip agglo580 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 6617Sab Farewell terrane, Nixon Fork subterrane of Decker and others (1994), algal boundstone Upper Silurian, Ludlovian and Pridolian Thick to massive bedded, light gray algal boundstone, locally dolomitized; composed primarily of spongiostromate algal heads (including abundant oncoid forms). Rock unit represents a barrier reef complex on the outer or seaward margin of the Silurian ca836708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 6620Sls Farewell terrane, Nixon Fork subterrane of Decker and others (1994), lime mudstone Upper Silurian, late Llandoverian to Wenlockian Primarily thin- to medium-bedded, laminated, dark gray to dark brown, platy lime mudstone, having strong petroliferous odor (Blodgett and Wilson, 2001). Coarse-grained limestone debris-flows having clasts of algal boundstone reef material common in uppe700 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 7510Olss Farewell terrane, Nixon Fork subterrane of Decker and others (1994), tcherskidium-bearing limestone Upper Ordovician, Ashgillian Brown, medium- to thick-bedded skeletal lime packstone to wackestone (Blodgett and Wilson, 2001). Contains abundant pentameroid brachiopods (Tcherskidium, Proconchidium (or Eoconchidium), and new genus (smooth) aff. Tcherskidium) 461 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 7515Os Farewell terrane, Nixon Fork subterrane of Decker and others (1994), shale Ordovician Extremely poorly exposed brown and dark gray 'chippy' shale, silty shale and minor silicified limestone (Blodgett and Wilson, 2001). Outcrops in Taylor Mountains D-1 1:63,360-scale quadrangle consist only of frost-boil exposures, however, one rubble out45815 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 7560Oab Farewell terrane, Nixon Fork subterrane of Decker and others (1994), algal boundstone and lime mudstone Lower Ordovician Medium- to thick-bedded, dark-gray to brown algal thrombolites (boundstone) interbedded with light-gray weathering thin- to medium-bedded lime mudstone (Blodgett and Wilson, 2001). Trilobites and a conodonts (identified by N.M. Savage, written commun. 1509708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 7570Ols Farewell terrane, Nixon Fork subterrane of Decker and others (1994), lime mudstone Lower Ordovician Thin- to medium-bedded, yellow-gray weathering, dark-gray fresh, burrow mottled lime mudstone (Blodgett and Wilson, 2001). Peloidal mudstone locally common. Age control based on poorly preserved low-spired gastropods and conodonts including Drepanoisto458 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 8014Cls Farewell terrane, Nixon Fork subterrane of Decker and others (1994), llimestone Middle Cambrian Two separate Middle Cambrian limestone subunits are included in this unit in the adjoining Sleetmute A-2 1:63,360 scale quadrangle where it is best developed and exposed (Blodgett and others, in prep). The upper and thicker overlying subunit, exposed in602708Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 8015Cs Farewell terrane, Nixon Fork subterrane of Decker and others (1994), clastic and carbonate rocks Lower Cambrian This unit is quite heterogeneous and consists of dark-gray (weathering light-gray) orthoquartzite, locally having well-developed parallel laminations; light-gray (weathering white), thin- to medium-bedded lime mudstone having abundant trilobites (observe600 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 8340DZn Farewell terrane, Nixon Fork subterrane of Decker and others (1994), undivided Devonian(?) to Proterozoic The map units described here come largely from the unpublished work of R.B. Blodgett and co-workers 836 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh 9120Zs Farewell terrane, Nixon Fork subterrane of Decker and others (1994), dolostone, limestone, orthoquartzite, and minor chertNeoproterozoic? Medium-bedded, medium-gray, orange weathering dolostone, limestone, orthoquartzite, and minor chert. Dolostone has locally abundant floating quartz grains, is locally trough cross-stratified, but also has well developed parallel laminations, low domal s333 Wilson, F.H,, Blodgett, R.B., Blome, C.D., Mohadjer, Solmaz, Preller, C.C., Klimasaukas, E.P., Gamble, B.M., and Coonrad, W.L., in press, Reconnaissance bedrock geologic map for the northern Alaska Peninsula area, southwest Alaska, including the Dillingh