Bed
Unconsolidated
Coarse-detrital
Gravel
Indeterminate, major
Unconsolidated, Coarse-detrital, Gravel, ,
Sand
Unconsolidated, Coarse-detrital, Sand, ,
Fine-detrital
Silt
Unconsolidated, Fine-detrital, Silt, ,
Clay
Unconsolidated, Fine-detrital, Clay, ,
Peat
Unconsolidated, Peat, , ,
Mass
Glaciers and perennial ice fields
Ice
Major
Ice, , , ,
Lake, stream, or ocean
Water bodies shown on geologic maps
Water
Water, , , ,
Swamp
Unconsolidated, Fine-detrital, , ,
Colluvial
Unconsolidated, Coarse-detrital, , ,
Minor
Boulders
Unconsolidated, Coarse-detrital, Boulders, ,
Incidental
Landslide
Terrace, stream
Alluvial
Beach
Estuarine
Terrace, marine
Sedimentary
Chemical
Sedimentary, Chemical, , ,
Eolian
Glacial
Glacial, rock glacier
Solifluction
Glacial, esker
Eolian, Loess
Glacial, outwash
Unconsolidated, , , ,
Terrace
Glacial, drumlin
Glacial, till
Clastic
Sandstone
Sedimentary, Clastic, Sandstone, ,
Conglomerate
Sedimentary, Clastic, Conglomerate, ,
Siltstone
Sedimentary, Clastic, Siltstone, ,
Tailings
Flow
Igneous
Volcanic
Felsic-volcanic
Igneous, Volcanic, Felsic-volcanic, ,
Mafic-volcanic
Igneous, Volcanic, Mafic-volcanic, ,
Igneous, Volcanic, , ,
Basalt
Igneous, Volcanic, Mafic-volcanic, Basalt,
Pyroclastic
Rhyolite
Igneous, Volcanic, Felsic-volcanic, Rhyolite,
Pyroclastic, ash-flow
Dacite
Igneous, Volcanic, Felsic-volcanic, Dacite,
Volcaniclastic, lahar
Andesite
Igneous, Volcanic, Mafic-volcanic, Andesite,
Volcaniclastic
Pyroclastic, cinder cone
Pyroclastic, air fall
Stock or pipe
Dome
Hypabyssal
Felsic-hypabyssal
Hypabyssal-dacite
Igneous, Hypabyssal, Felsic-hypabyssal, Hypabyssal-dacite,
Hypabyssal-rhyolite
Igneous, Hypabyssal, Felsic-hypabyssal, Hypabyssal-rhyolite,
Mafic-hypabyssal
Hypabyssal-andesite
Igneous, Hypabyssal, Mafic-hypabyssal, Hypabyssal-andesite,
Dike or sill
Hypabyssal-basalt
Igneous, Hypabyssal, Mafic-hypabyssal, Hypabyssal-basalt,
Igneous, Hypabyssal, Mafic-hypabyssal, ,
Igneous, Hypabyssal, Felsic-hypabyssal, ,
Hornfels
Metamorphic
Granoblastic
Metamorphic, Granoblastic, Hornfels, ,
Arenite
Sedimentary, Clastic, Sandstone, Arenite,
Mudstone
Shale
Sedimentary, Clastic, Mudstone, Shale,
Graywacke
Sedimentary, Clastic, Sandstone, Graywacke,
Coal
Lignite
Sedimentary, Coal, Lignite, ,
Claystone
Sedimentary, Clastic, Mudstone, Claystone,
Sedimentary, Clastic, Mudstone, ,
Diamictite
Greenschist
Metasedimentary
Metaclastic
Argillite
Metamorphic, Metasedimentary, Metaclastic, Argillite,
Sub-bituminous
Sedimentary, Coal, Sub-bituminous, ,
Sedimentary, Coal, , ,
Carbonate
Limestone
Sedimentary, Carbonate, Limestone, ,
Arkose
Sedimentary, Clastic, Sandstone, Arenite, Arkose
Bituminous
Sedimentary, Coal, Bituminous, ,
Chert
Sedimentary, Chemical, Chert, ,
Slate
Metamorphic, Metasedimentary, Metaclastic, Slate,
Tectonite
Cataclastite
Tectonite, Cataclastite, , ,
Mylonite
Tectonite, Mylonite, , ,
Plutonic
Gabbroic
Gabbro
Igneous, Plutonic, Gabbroic, Gabbro,
Quartz-latite
Igneous, Volcanic, Felsic-volcanic, Quartz-latite,
Latite
Igneous, Volcanic, Felsic-volcanic, Latite,
Lamprophyre
Igneous, Hypabyssal, Lamprophyre, ,
Basaltic-andesite
Igneous, Volcanic, Mafic-volcanic, Basaltic-andesite,
Quartz-trachyte
Igneous, Volcanic, Felsic-volcanic, Quartz-trachyte,
Trachyte
Igneous, Volcanic, Felsic-volcanic, Trachyte,
Metaigneous
Greenstone
Metamorphic, Metaigneous, Greenstone, ,
Pluton
Granitic
Igneous, Plutonic, Granitic, ,
Granite
Syenogranite
Igneous, Plutonic, Granitic, Granite, Syenogranite
Dioritic
Diorite
Igneous, Plutonic, Dioritic, Diorite,
Igneous, Plutonic, Dioritic, ,
Quartz-diorite
Igneous, Plutonic, Dioritic, Quartz-diorite,
Igneous, Plutonic, Granitic, Granite,
Syenitic
Quartz-monzonite
Igneous, Plutonic, Syenitic, Quartz-monzonite,
Monzodiorite
Igneous, Plutonic, Dioritic, Monzodiorite,
Alkali-feldspar-granite
Igneous, Plutonic, Granitic, Alkali-feldspar-granite,
Tonalite
Igneous, Plutonic, Granitic, Tonalite,
Monzonite
Igneous, Plutonic, Syenitic, Monzonite,
Granodiorite
Igneous, Plutonic, Granitic, Granodiorite,
Syenite
Igneous, Plutonic, Syenitic, Syenite,
Melange
Ultramafic
Peridotite
Igneous, Plutonic, Ultramafic, Peridotite,
Amphibolite
Migmatite
Metamorphic, Migmatite, , ,
Metamorphic, Amphibolite, , ,
Gneiss
Metamorphic, Gneiss, , ,
Zeolitic (prehnite-pumpellyite)
Pyroclastic, tuff
Igneous, Hypabyssal, , ,
Igneous, Plutonic, Dioritic, Tonalite,
Igneous, Plutonic, Gabbroic, ,
Quartz-monzodiorite
Igneous, Plutonic, Dioritic, Quartz-monzodiorite,
Unit tends to be uniformly foliated and includes migmatite.  See NSA 1663
Includes tonalite and quartz diorite in part, see NSA 1662
Leucocratic-granitic
Pegmatite
Igneous, Plutonic, Granitic, Leucocratic-granitic, Pegmatite
Gneissose plutonic rocks
Tuffaceous
Melange, matrix
Tectonite, Melange, , ,
Calcareous
Sedimentary, Clastic, Sandstone, Arkose,
Mixed-clastic
Sandstone-Mudstone
Sedimentary, Clastic, Mixed-clastic, Sandstone-Mudstone,
Calcarenite
Sedimentary, Clastic, Sandstone, Arenite, Calcarenite
Volcaniclastic, volcanic breccia
Flow, pillows
Black-shale
Sedimentary, Clastic, Mudstone, Shale, Black-shale
Melange, blocks
Tectonite, Melange, Limestone, ,
Tectonite, Melange, Ultramafic, ,
Lacustrine
Reef
Hypabyssal-basaltic-andesite
Igneous, Hypabyssal, Mafic-hypabyssal, Hypabyssal-basaltic-andesite,
Alkalic-volcanic
Igneous, Volcanic, Alkalic-volcanic, ,
Sedimentary, Clastic, , ,
Conglomerate-sandstone
Sedimentary, Clastic, Mixed-clastic, Conglomerate-sandstone,
Gabbronorite
Igneous, Plutonic, Gabbroic, Gabbro, Gabbronorite
Bentonite
Sedimentary, Clastic, Mudstone, Claystone, Bentonite
Monzogranite
Igneous, Plutonic, Granitic, Granite, Monzogranite
Serpentinite
Metamorphic, Metaigneous, Serpentinite, ,
Metavolcanic
Metamorphic, Metaigneous, Metavolcanic, ,
Alaskite
Igneous, Plutonic, Granitic, Leucocratic-granitic, Alaskite
Hornblendite
Igneous, Plutonic, Ultramafic, Hornblendite,
Trondhjemite
Igneous, Plutonic, Granitic, Tonalite, Trondhjemite
Foidal-syenitic
Nepheline-syenite
Igneous, Plutonic, Foidal-syenitic, Nepheline-syenite,
Igneous, Plutonic, Syenitic, ,
Schist
Metamorphic, Schist, , ,
Metamorphic, Hornfels, , ,
Metabasalt
Metamorphic, Metaigneous, Metavolcanic, Metabasalt,
Sedimentary, Clastic, Mixed-clastic, ,
Metasandstone
Metamorphic, Metasedimentary, Metaclastic, Metasandstone,
Quartzite
Metamorphic, Metasedimentary, Metaclastic, Quartzite,
Siltstone-Mudstone
Sedimentary, Clastic, Mixed-clastic, Siltstone-Mudstone,
Sedimentary, Argillite, , ,
Igneous, Volcanic, Mafic-volcanic, Latite,
Igneous, Plutonic, Ultramafic, ,
Sandstone blocks
Conglomerate blocks
Pillow basalt and chert blocks
Tonalite and greenstone blocks
Metamorphosed turbidites
Quartz-feldspar-schist
Metamorphic, Schist, Quartz-feldspar-schist, ,
Metamorphosed turbidites -- flysch
Sedimentary, , , ,
Numerous limestone concretions
Numerous large limestone concretions
Phosphatic-shale
Sedimentary, Clastic, Mudstone, Shale, Phosphatic-shale
Volcanogenic
Phyllite
Metamorphic, Metasedimentary, Metaclastic, Phyllite,
Gray, green, and black phyllite, fine-grained tuff, and tuffaceous chert.
Classic pebble shale unit of North Slope, contains scattered, rounded and frosted quartz grains.
Norite
Igneous, Plutonic, Gabbroic, Gabbro, Norite
Commonly serpentinized
Dunite
Igneous, Plutonic, Ultramafic, Peridotite, Dunite
Pyroxenite
Igneous, Plutonic, Ultramafic, Pyroxenite,
Monzogabbro
Igneous, Plutonic, Gabbroic, Monzogabbro,
Melilitic
Igneous, Plutonic, Melilitic, ,
Metamorphic, , , ,
Mica-schist
Metamorphic, Schist, Mica-schist, ,
Metacarbonate
Marble
Metamorphic, Metasedimentary, Metacarbonate, Marble,
Glaucophane-schist
Orthogneiss
Metamorphic, Metaigneous, Orthogneiss, ,
Pelitic schist
schist
Metamorphic, Metasedimentary, Metaclastic, Pelitic schist,
Igneous, , , ,
Coquina
Sedimentary, Carbonate, Limestone, Coquina,
Diabase
Igneous, Plutonic, Gabbroic, Diorite,
Limestone and basalt which grades southwestward into interbedded gray limestone, dark-green pillow basalt, massive and locally semischistose basaltic tuff, calcareous sandstone, and minor black chert and silty limestone.
Lense
A long narrow belt of unfossiliferous, massive to thick bedded, white to light gray, fine grained marble.
Dark-gray banded spiculite and chert, yellowish-orange-weathering sandy fossiliferous limestone and conglomerate and dark-gray shale
Oil-shale
Sedimentary, Clastic, Mudstone, Shale, Oil-shale
Red beds
Carbonaceous
Dolostone
Sedimentary, Carbonate, Dolostone, ,
Fault-bounded lenses
Magnetite-rich
Intrusive-carbonatite
Igneous, Plutonic, Intrusive-carbonatite, ,
Incredibly thick and distinctive rock unit
Low greenschist facies
Weakly metamorphosed
Metamorphosed
Metamorphosed volcanic and volcaniclastic rocks
Amygdaloidal metabasalt
Medium-bedded dark brown limestone and sooty carbonaceous limestone
Black chert
Carbonaceous turbidites
Pillow basalt, volcanic breccia, and banded rhyolite form lateral and overlying facies to limestone, argillite, and volcanic sandstone.
Basaltic pillow breccia and pillow lava flows, andesitic volcanic breccia, aquagene tuff, tuff breccia, minor thin bedded limestone
Olistrostrome
Mostly matrix supported deposits representing debris flows.
Volcanic clasts
Thick-bedded oolitic limestone
Dark gray to black carbonaceous, rhythmically bedded argillite
Slightly metamorphosed basalt having relict pillows
Semischistose metagraywacke, locally pebbly metagraywacke, metatuff, metamudstone, and conglomerate
Metagraywacke
Metamorphic, Metasedimentary, Metaclastic, Metasandstone, Metagraywacke
Metamorphic, Metavolcanic, , ,
Metamorphic, Metasedimentary, , ,
Slightly to moderately metamorphosed graphitic siltite, slate, graywacke, and calcareous siltite.
Medium- to coarse-grained, massive, and well-foliated biotite-hornblende gneisses, garnetiferous amphibolites, quartz-mica schists, and marble.
Chloritic schists and marble schists.
Amphibolite, epidote-amphibolite
Retrograded
Schistose limestone.
Dark schistose limestone
Chloritic schist
Biotite-schist
Metamorphic, Schist, Mica-schist, Biotite-schist,
Marble and calc-silicate rocks.
Paragneiss
Metamorphic, Metasedimentary, Paragneiss, ,
Igneous, Plutonic, Granitic, Leucocratic-granitic,
Metaintrusive
Metaultramafic
Metamorphic, Metaigneous, Metaintrusive, Metaultramafic,
Quartz-gabbro
Igneous, Plutonic, Gabbroic, Quartz-gabbro,
Primarily consists of metamorphosed flows and tuffs of basaltic and andesitic compositions.  Mudstone, bioclastic marble, and dark-gray to black phyllite are subordinate.
Weakly metamorphosed, cherty
Quartz-syenite
Igneous, Plutonic, Syenitic, Quartz-syenite,
Anorthosite
Igneous, Plutonic, Anorthosite, ,
Metavolcanic schist
Locally metamorphosed to greenschist facies
Dark-greenish-gray, fine- to coarse-grained augite- and hornblende-bearing mafic diorite and gabbro.  Regionally metamorphosed (greenschist facies)
Metaconglomerate
Chiefly schistose, fine-grained meta-andesite tuff and flows, and coarse-grained breccia and conglomerate, along with minor dark-gray argillite.
Chiefly schistose, fine-grained metaandesite tuff and flows, and coarse-grained breccia and conglomerate, along with minor dark-gray argillite.
Calc-silicate-schist
Metamorphic, Schist, Calc-silicate-schist, ,
Dominantly dark-gray, typically phyllitic, silicieous to carbonaceous argillite and shale, having subordinate but characteristic clast-supported chert-rich conglomerate, greenish-gray chert, tuffaceous volcaniclastic rocks, yellowish- to reddish-brown hi
Volcaniclastic rocks not seen in Brooks Range exposures
Metabasite
Dark-greenish-gray massive-weathering mafic volcanic rocks that include pillow basalt, breccia, agglomerate, tuff, and massive basalt flows.  Volcanic rocks commonly contain interbeds of black phyllite, chert-pebble conglomerate, light-green tuff, and gr
Dark-gray to black phyllite with subordinate fine-grained metagraywacke
Conglomerate-mudstone
Sedimentary, Clastic, Mixed-clastic, Conglomerate-mudstone,
Medium to thick, well-bedded dolomite and limestone with local black chert nodules and thin irregular chert beds; locally metamorphosed to marble and strongly sheared;
Is this metamorphic?
Some descriptions indicate 75 percent limestone and 25 percent shale
Strong petroliferous odor.  Coarse-grained limstone debris-flows having clasts of algal boundstone reef material common in uppermost part of unit
Middle Endicott Group, Kanayut conglomarate (Upper Devonian and Lower Mississippian) - Nonmarine sandstone, conglomerate, and shale with minor marine tongues.  Noatak sandstone (Upper Devonian) - Marine, partly calcareous, sandstone, and shale.
Very light gray to brownish red weathering resistant schistose felsic volcanic rocks
Sheared and foliated quartz and quartz-feldspar grits and quartzite intercalated with quartz-muscovite-chlorite and quartz-muscovite-biotite schists.  Subordinate phyllite, thin limestone, and metachert.
Metasiltstone
Metamorphic, Metasedimentary, Metaclastic, Metasiltstone,
Metamorphosed chert
Igneous, Volcanic, Limestone, ,
Primarily quartzite, but also gray and green sandstone
Metaandesite
Metamorphic, Metaigneous, Metavolcanic, Metaandesite,
Siltstone-mudstone
Sedimentary, Clastic, Mixed-clastic, Siltstone-mudstone,
Metamorphosed silicic tuff?
Metarhyolite
Metamorphic, Metaigneous, Metavolcanic, Metarhyolite,
Eclogite
Metamorphic, Eclogite, , ,
Tending toward mafic plutonic rocks
Amphibole-schist
Metamorphic, Schist, Amphibole-schist, ,
Metamorphosed diorite
Lens
Mylonitic rocks
Muscovite-schist
Metamorphic, Schist, Mica-schist, Muscovite-schist,
Metavolcanic hornblende schist
Black slate and phyllite, with banded siltstone, graywacke, chert, limestone, conglomerate, and volcanic layers.
Metasedimentary pelitic schist
Fossiliferous marble
Black, carbonaceous phyllite
metagraywacke and marble.
Basaltic and andesitic flows, tuff, breccia, and volcanic conglomerate altered to greenstone
Batholith
Sandstone-mudstone
Sedimentary, Clastic, Mixed-clastic, Sandstone-mudstone,
Bentonitic
Bentonitic mudstone, shale, and thin-bedded bentonitic sandstone
Bentonitic mudstone, thin-bedded bentonitic sandstone, and bentonite
Metamorphic, Metasedimentary, Metaclastic, ,
Sedimentary, Carbonate, , ,
Metagabbro and metadiorite
Metamorphic, Metasedimentary, Metacarbonate, ,
Partially to completely recrystallized schistose rocks with mafic igneous protoliths, including pillow basalts, angular volcanic breccia, pebbly mudstone, fine tuffaceous sedimentary rocks, diabase, gabbro, and rare chert
Partially recrystallized schistose rocks with sandstone, shale, and conglomerate protoliths derived from feldspar-rich volcanic source
Igneous, Plutonic, , ,
Felsic alkalic rocks, trachyte
Intermediate alkalic rocks, mugearite and benmoreite
Alkalic basalt and hawaiite
Alkalic rocks, Mugearite and benmoreite flows
Blocks in the McHugh Complex melange
Metadacite
Metamorphic, Metaigneous, Metavolcanic, Metadacite,
Metamorphic, Metasedimentary, Metaclastic, Metaconglomerate,
Metagabbro
Metamorphic, Metaigneous, Metaintrusive, Metagabbro,
Calc-silicate-rock
Metamorphic, Metasedimentary, Calc-silicate-rock, ,
Biotite-gneiss
Metamorphic, Gneiss, Biotite-gneiss, ,
Hornblende-gneiss
Metamorphic, Gneiss, Hornblende-gneiss, ,
Banded-iron-formation
Sedimentary, Chemical, Banded-iron-formation, ,
These might be more correctly classifed as metasedimentary rocks
Dolomitic marble and dolostone
Hypabyssal-felsic-alkaline
Igneous, Hypabyssal, Felsic-hypabyssal, Hypabyssal-felsic-alkaline,