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Geologic units in Elko county, Nevada

[Additional scientific data in this geographic area]

Miocene rhyolites (Middle to Late Miocene) at surface, covers < 0.1 % of this area
Lithology: rhyolite; dacite
Tertiary intrusive rocks in western Utah (Late Eocene to Early Miocene) at surface, covers < 0.1 % of this area
Lithology: granodiorite; granite; quartz monzonite; quartz diorite
Tertiary (4) sedimentary rocks in western Utah (Middle Miocene to Late Pliocene) at surface, covers < 0.1 % of this area
Lithology: coarse-grained mixed clastic; alluvium; pyroclastic; basalt; evaporite
Silurian carbonate rocks in western Utah (Silurian) at surface, covers < 0.1 % of this area
Lithology: dolostone (dolomite); chert
Quaternary Lake Bonneville deposits (Quaternary) at surface, covers < 0.1 % of this area
Lithology: clay or mud; sand; gravel; silt
Older Quaternary alluvial deposits (Quaternary) at surface, covers < 0.1 % of this area
Lithology: alluvium
Quaternary alluvium and colluvium (Quaternary) at surface, covers < 0.1 % of this area
Lithology: alluvium; colluvium
Younger Precambrian metamorphic rocks in western Utah (Precambrian) at surface, covers < 0.1 % of this area
Lithology: conglomerate; metamorphic rock
Permian (1) sedimentary rocks in western Utah (Early Permian) at surface, covers < 0.1 % of this area
Lithology: sandstone; carbonate; fine-grained mixed clastic; evaporite
Ordovician sedimentary rocks in western Utah (Ordovician) at surface, covers < 0.1 % of this area
Lithology: limestone; fine-grained mixed clastic; sandstone; dolostone (dolomite)
Mississippian (1) carbonate rocks in western Utah (Mississippian) at surface, covers < 0.1 % of this area
Lithology: limestone
Devonian sedimentary rocks in western Utah (Devonian to Mississippian) at surface, covers < 0.1 % of this area
Lithology: dolostone (dolomite); limestone; siltstone; mudstone
Upper Cambrian carbonate rocks in western Utah (Middle Cambrian to Early Ordovician) at surface, covers < 0.1 % of this area
Lithology: limestone; dolostone (dolomite); shale
Middle Cambrian shale and carbonate rocks in western Utah (Middle Cambrian) at surface, covers < 0.1 % of this area
Lithology: limestone; shale; dolostone (dolomite); argillite
Cambrian quartzite in western Utah (Early Cambrian) at surface, covers < 0.1 % of this area
Lithology: arenite; conglomerate
Quartzite, phyllitic siltstone, conglomerate, limestone, and dolomite (Late Proterozoic) at surface, covers < 0.1 % of this area
QUARTZITE, PHYLLITIC SILTSTONE, CONGLOMERATE, LIMESTONE, AND DOLOMITE-Includes McCoy Creek Group (excluding Stella Lake Quartzite) in east-central Nevada and Johnnie Formation in southern Nevada.
Lithology: quartzite; shale; conglomerate; siltstone; dolostone (dolomite)
Ash-flow tuffs and tuffaceous sedimentary rocks (Middle Miocene to Late Miocene) at surface, covers 1.0 % of this area
ASH-FLOW TUFFS AND TUFFACEOUS SEDIMENTARY ROCKS
Lithology: ash-flow tuff; rhyolite; sandstone; dacite; trachyte
Welded and nonwelded silicic ash-flow tuffs (Middle Miocene to Late Miocene) at surface, covers 4 % of this area
WELDED AND NONWELDED SILICIC ASH-FLOW TUFFS-Locally includes thin units of air-fall tuff and sedimentary rock
Lithology: rhyolite
Welded and nonwelded silicic ash-flow tuffs (Early Oligocene to Early Miocene) at surface, covers 0.9 % of this area
WELDED AND NONWELDED SILICIC ASH-FLOW TUFFS-Locally includes thin units of air-fall tuff and sedimentary rock
Lithology: rhyolite; dacite; trachyte
Welded and nonwelded silicic ash-flow tuffs (Late Eocene to Middle Eocene) at surface, covers 4 % of this area
WELDED AND NONWELDED SILICIC ASH-FLOW TUFFS-Locally includes thin units of air-fall tuff and sedimentary rock
Lithology: rhyolite; dacite; trachyte
Tuffaceous sedimentary rocks (Late Eocene to Late Miocene) at surface, covers 16 % of this area
TUFFACEOUS SEDIMENTARY ROCKS-Locally includes minor amounts of tuff
Lithology: sandstone; limestone; siltstone; conglomerate; mudstone; dolostone (dolomite); felsic volcanic rock; intermediate volcanic rock; mafic volcanic rock; tuff
Tuffaceous sedimentary rocks (Early Oligocene to Early Miocene) at surface, covers < 0.1 % of this area
TUFFACEOUS SEDIMENTARY ROCKS-Locally includes minor amounts of tuff
Lithology: sandstone; siltstone; limestone; conglomerate; mudstone; debris flow; landslide; tuff
Sedimentary rocks (Late Cretaceous to Oligocene) at surface, covers 0.8 % of this area
SEDIMENTARY ROCKS-Includes Sheep Pass Formation (Eocene) and related units and unnamed tuffaceous sedimentary rocks
Lithology: sandstone; conglomerate; limestone; siltstone; claystone; mudstone; shale; tuff; oil shale
Ash-flow tuffs, rhyolitic flows, and shallow intrusive rocks (Middle Miocene to Late Miocene) at surface, covers < 0.1 % of this area
ASH-FLOW TUFFS, RHYOLITIC FLOWS, AND SHALLOW INTRUSIVE ROCKS
Lithology: rhyolite; dacite; trachyte
Silty limestone, minor amounts of shale, and some greenstone (Permian to Early Triassic) at surface, covers < 0.1 % of this area
SILTY LIMESTONE, MINOR AMOUNTS OF SHALE, AND SOME GREENSTONE-Unnamed sequence in Adobe Range, northern Elko County
Lithology: limestone; shale; greenstone
Moenkopi Formation, Thaynes Formation, and related rocks (Early Triassic to Middle Triassic) at surface, covers 0.6 % of this area
MOENKOPI FORMATION, THAYNES FORMATION, AND RELATED ROCKS (Lower Triassic)-Marine deposits of siltstone, limestone, and sparse conglomerate
Lithology: shale; limestone; siltstone; sandstone; gypsum; dolostone (dolomite); conglomerate
Rhyolitic intrusive rocks (Eocene to Miocene) at surface, covers < 0.1 % of this area
RHYOLITIC INTRUSIVE ROCKS
Lithology: granitoid
Chinle Formation and associated rocks (Late Triassic) at surface, covers < 0.1 % of this area
CHINLE FORMATION AND ASSOCIATED ROCKS (Upper Triassic)-Continental deposits of variegated bentonitic claystone, siltstone, and clayey sandstone; ledge-forming sandstone; and red siltstone
Lithology: claystone; siltstone; sandstone; gypsum; conglomerate; limestone
Rhyolitic flows and shallow intrusive rocks (Middle Miocene to Late Miocene) at surface, covers 7 % of this area
RHYOLITIC FLOWS AND SHALLOW INTRUSIVE ROCKS
Lithology: rhyolite; dacite; trachyte
Rhyolitic flows and shallow intrusive rocks (Early Oligocene to Early Miocene) at surface, covers < 0.1 % of this area
RHYOLITIC FLOWS AND SHALLOW INTRUSIVE ROCKS
Lithology: rhyolite; dacite; trachyte
Rhyolitic flows and shallow intrusive rocks (Late Eocene to Middle Eocene) at surface, covers 0.7 % of this area
RHYOLITIC FLOWS AND SHALLOW INTRUSIVE ROCKS
Lithology: rhyolite; dacite; trachyte
Older basalt rocks (Early Oligocene to Early Miocene) at surface, covers < 0.1 % of this area
OLDER BASALT ROCKS
Lithology: basalt; andesite
Intrusive rocks of mafic to intermediate composition (Eocene to Miocene) at surface, covers < 0.1 % of this area
INTRUSIVE ROCKS OF MAFIC TO INTERMEDIATE COMPOSITION
Lithology: diorite; monzodiorite; quartz diorite; quartz monzogabbro; tonalite; gabbro
Granitic rocks, central and eastern Nevada (Jurassic to Miocene) at surface, covers < 0.1 % of this area
GRANITIC ROCKS, CENTRAL AND EASTERN NEVADA-Mostly quartz monzonite and granodiorite. Inconclusively dated or not dated radiometrically
Lithology: quartz monzonite; granodiorite; granite; peraluminous granite
Granitic rocks (Paleocene to Late Miocene) at surface, covers 0.3 % of this area
GRANITIC ROCKS-Mostly quartz monzonite and granodiorite
Lithology: granodiorite; quartz monzonite; granite; monzonite
Breccia (Middle Eocene to Early Pliocene) at surface, covers < 0.1 % of this area
BRECCIA-Volcanic, thrust, and jasperoid breccia and landslide megabreccia
Lithology: volcanic breccia (agglomerate); tectonite; landslide
Banbury Formation (Middle Miocene to Late Miocene) at surface, covers 7 % of this area
BANBURY FORMATION-Basalt, gravel, and tuffaceous sediments locally. Northeast Humboldt County and northwest Elko County
Lithology: basalt; gravel; sandstone
Andesite and basalt flows (Early Miocene to Early Pliocene) at surface, covers < 0.1 % of this area
ANDESITE AND BASALT FLOWS-Mostly in about 17 to about 6 m.y. age range. In Humboldt County, locally includes rocks as old as 21 m.y. May include rocks younger than 6 m.y. in places
Lithology: basalt; andesite; shoshonite
Basalt flows (Late Miocene to Middle Miocene) at surface, covers 0.4 % of this area
BASALT FLOWS
Lithology: basalt
Andesite and related rocks of intermediate composition (Late Miocene to Middle Miocene) at surface, covers 0.3 % of this area
ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
Lithology: andesite; latite; trachyte; dacite
Andesite and related rocks of intermediate composition (Early Oligocene to Early Miocene) at surface, covers 0.9 % of this area
ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
Lithology: andesite; trachyte; dacite
Andesite and related rocks of intermediate composition (Late Eocene to Middle Eocene) at surface, covers 1 % of this area
ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
Lithology: andesite; latite
Platy limestone and limy siltstone, chert at base (Silurian to Early Devonian) at surface, covers 0.2 % of this area
PLATY LIMESTONE AND LIMY SILTSTONE, CHERT AT BASE-Includes units such as Roberts Mountains Formation, and Storff Formation and Chellis Limestone of Decker (1962). Locally includes rocks of Early Devonian age at top.
Lithology: limestone; dolostone (dolomite); chert; siltstone; shale
Shale and chert (Silurian) at surface, covers < 0.1 % of this area
SHALE AND CHERT-Includes Fourmile Canyon Formation in Eureka County and Noh Formation of Riva (1970) and unnamed rocks in Elko County.
Lithology: shale; siltstone; chert; sandstone; limestone
Dolomite (Silurian to Early Devonian) at surface, covers < 0.1 % of this area
DOLOMITE-Includes units such as Laketown and Lone Mountain Dolomites. Locally includes rocks of Early Devonian age at top.
Lithology: dolostone (dolomite); limestone; chert; sedimentary breccia
Sedimentary rocks (Pliocene to Quaternary) at surface, covers 0.1 % of this area
SEDIMENTARY ROCKS-Mostly lake deposits
Lithology: lake or marine deposit (non-glacial); sedimentary rock
Older alluvial deposits (Miocene to Quaternary) at surface, covers 0.7 % of this area
OLDER ALLUVIAL DEPOSITS
Lithology: alluvium; lake or marine deposit (non-glacial)
Intrusive rocks of mafic and intermediate composition (Miocene to Quaternary) at surface, covers < 0.1 % of this area
INTRUSIVE ROCKS OF MAFIC AND INTERMEDIATE COMPOSITION
Lithology: andesite; rhyodacite; basalt; sedimentary rock
Playa, marsh, and alluvial-flat deposits, locally eroded (Quaternary) at surface, covers 3 % of this area
PLAYA, MARSH, AND ALLUVIAL-FLAT DEPOSITS, LOCALLY ERODED
Lithology: playa; alluvium
Morainal deposits (Quaternary) at surface, covers 0.4 % of this area
MORAINAL DEPOSITS
Lithology: glacial drift
Landslide deposits (Quaternary) at surface, covers 0.3 % of this area
LANDSLIDE DEPOSITS
Lithology: landslide; colluvium; sedimentary rock
Alluvial deposits (Quaternary) at surface, covers 6 % of this area
ALLUVIAL DEPOSITS-Locally includes beach and sand dune deposits
Lithology: alluvium; mass wasting; dune sand; lake or marine deposit (non-glacial)
Siltstone, sandstone, limestone, and dolomite (commonly silty or sandy) and gypsum (Early Permian) at surface, covers 2 % of this area
SILTSTONE, SANDSTONE, LIMESTONE, AND DOLOMITE (COMMONLY SILTY OR SANDY), AND GYPSUM (Lower Permian)-Includes units such as Rib Hill Sandstone and Pequop Formation of Steele (1959) in Elko County, Rib Hill Sandstone and Arcturus Formation in White Pine County, Queantoweap Sandstone of NcNair (1951), Hermit Shale, and Coconino Sandstone in Clark and southern Lincoln Counties.
Lithology: sandstone; limestone; shale; siltstone; dolostone (dolomite); evaporite (gypsum); chert; quartzite
Sandy and silty limestone, conglomerate, and siltstone (Pennsylvanian to Late Permian) at surface, covers 0.8 % of this area
SANDY AND SILTY LIMESTONE, CONGLOMERATE, AND SILTSTONE (Upper Pennsylvanian to Upper Permian)-Includes units such as Strathearn Formation of Dott (1955) and Buckskin Mountain, Beacon Flat, and Carlin Canyon Formations of Dott (1955)
Lithology: limestone; conglomerate; siltstone; sandstone; chert
Limestone and sparse dolomite, siltstone, and sandstone (Mississippian to Early Permian) at surface, covers 1 % of this area
LIMESTONE AND SPARSE DOLOMITE, SILTSTONE, AND SANDSTONE-Includes units such as undivided Riepe Spring Limestone of Steele (1960) and Ely Limestone or their equivalent in Elko, White Pine, and northern Lincoln Counties and most of the Bird Spring Formation and Callville Limestone in Clark and southern Lincoln Counties. Includes some stratigraphically higher Permian rocks in Leppy Peak, easternmost Elko County.
Lithology: limestone; sandstone; siltstone; chert; shale; dolostone (dolomite); conglomerate
Antler Sequence of Silberling and Roberts (1962) (Pennsylvanian to Late Permian ) at surface, covers < 0.1 % of this area
ANTLER SEQUENCE OF SILBERLING AND ROBERTS (1962) (Middle Pennsylvanian to Early or Late Permian) (Guadalupian)-Conglomerate, sandy to conglomeratic limestone, limestone, sandstone, and calcareous shale. Thin detrital and carbonate sequence within main part of Antler orogenic belt. Includes units such as Sunflower Formation of Bushnell (1967) in Elko County, Battle Formation, Antler Peak Limestone, and Edna Mountain Formation in Lander and western Eureka Counties, and Wildcat Peak Formation in northern Nye County
Lithology: conglomerate; limestone; sandstone; siltstone; shale
Havallah sequence of Silberling and Roberts (1962) (Mississippian to Permian) at surface, covers 0.6 % of this area
HAVALLAH SEQUENCE OF SILBERLING AND ROBERTS (1962)-Chert, argillite, shale, greenstone, and minor amounts of siltstone, sandstone, conglomerate, and limestone. Includes Schoonover Formation of Fagan (1962) and Reservation Hill Formation in Elko County, Farrel Canyon Formation in southwestern Humboldt County, Havallah and Pumpernickel Formations in Pershing, Lander, and parts of Humboldt Counties, and rocks originally considered a part of the Pablo and Excelsior Formations in northern Nye, northern Esmeralda, and southern Mineral Counties. Assignment of some rocks to the Havallah sequence in the East Range, Pershing County, is highly uncertain. Includes rocks ranging in age from Late Mississippian to Early Permian
Lithology: shale; metavolcanic rock; chert; siltstone; sandstone; conglomerate; limestone
Limestone, dolomite, and shale (Mississippian to Permian) at surface, covers 0.9 % of this area
LIMESTONE, DOLOMITE, AND SHALE (Upper Paleozoic)-Includes Van Duzer Limestone of Decker (1962)
Lithology: limestone; shale; sandstone; quartzite; siltstone; chert; conglomerate
Cherty limestone and sparse dolomite, shale, and sandstone (Permian) at surface, covers 2 % of this area
CHERTY LIMESTONE AND SPARSE DOLOMITE, SHALE, AND SANDSTONE (Lower and Upper Permian)-Includes units such as Park City Group and equivalent rocks in northern Nevada and Toroweap Formation and Kaibab Limestone in southern Nevada
Lithology: limestone; shale; dolostone (dolomite); sandstone; siltstone; chert; conglomerate; phosphorite; evaporite
Limestone, cherty limestone, sandy limestone, and chert-pebble conglomerate (Pennsylvanian) at surface, covers 0.2 % of this area
LIMESTONE, CHERTY LIMESTONE, SANDY LIMESTONE, AND CHERT-PEBBLE CONGLOMERATE (Lower and Middle Pennsylvanian)-Includes units such as Moleen and Tomera Formations of Dott (1955)
Lithology: limestone; conglomerate
Shale, chert, and limestone (Ordovician) at surface, covers < 0.1 % of this area
SHALE, CHERT, AND LIMESTONE-Includes Aura Formation of Decker (1962) in northwest Elko County and Perkins Canyon Formation of Kay and Crawford (1964) in northern Nye County
Lithology: shale; chert; limestone; quartzite
Siliceous and volcanic rocks (Ordovician to Devonian) at surface, covers 1 % of this area
SILICEOUS AND VOLCANIC ROCKS-Chert, shale, quartzite, greenstone, and minor amounts of limestone. Includes units such as Valmy Formation of north-central Nevada and some rocks mapped as Palmetto Formation in northern part of Esmeralda County and adjacent parts of Mineral and Nye Counties. Locally includes rocks of Silurian and Devonian age.
Lithology: chert; quartzite; shale; greenstone; limestone; conglomerate; siltstone; chemical
Shale, chert, and minor amounts of quartzite, greenstone, and limestone (Ordovician) at surface, covers 1 % of this area
SHALE, CHERT, AND MINOR AMOUNTS OF QUARTZITE, GREENSTONE, AND LIMESTONE-Includes units such as Vinini Formation of north-central Nevada, Palmetto Formation in southern and central parts of Esmeralda County, and Comus Formation in Humboldt County. Locally includes rocks of Silurian and Devonian age.
Lithology: chert; shale; limestone; quartzite; andesite; siltstone; sandstone; chemical; greenstone; dolostone (dolomite)
Phyllite, shale, and limestone (Middle Cambrian to Ordovician) at surface, covers 0.3 % of this area
PHYLLITE, SHALE, AND LIMESTONE-Locally includes chert and quartzite. Includes Tennessee Mountain Formation of Bushnell (1967) in western Elko County, Broad Canyon sequence of Means (1962) in Lander County, and rocks originally mapped as Palmetto Formation in Toiyabe and Toquima Ranges, northern Nye County
Lithology: shale; limestone; sandstone; chert
Limestone, dolomite, shale, and quartzite (Ordovician) at surface, covers 0.9 % of this area
LIMESTONE, DOLOMITE, SHALE, AND QUARTZITE-Includes units such as Pogonip Group, Eureka Quartzite, and Ely Springs Dolomite. Where Ely Springs Dolomite or equivalent rocks are included in SOc unit, this unit includes only the Pogonip Group and Eureka Quartzite or their equivalents.
Lithology: limestone; dolostone (dolomite); shale; quartzite; chert
Shale, siltstone, sandstone, chert-pebble conglomerate, and limestone (Devonian to Mississippian) at surface, covers 2 % of this area
SHALE, SILTSTONE, SANDSTONE, CHERT-PEBBLE CONGLOMERATE, AND LIMESTONE-Includes units such as Pilot Shale, Joana Limestone, Chainman Shale, and Diamond Peak Formation in northern and eastern Nevada and Narrow Canyon Limestone, Mercury Limestone, and Eleana Formation in southern Nevada
Lithology: shale; limestone; siltstone; sandstone; conglomerate; dolostone (dolomite); chert; quartzite
Conglomerate, limestone, meta-andesite, phyllite, and shale (Devonian to Mississippian) at surface, covers 0.1 % of this area
CONGLOMERATE, LIMESTONE, META-ANDESITE, PHYLLITE, AND SHALE-Includes Grossman, Banner, Nelson, and Mountain City Formation. Northern Elko County
Lithology: schist; metavolcanic rock; conglomerate; sandstone; siltstone; phyllite; limestone; diabase
Continental deposits of siltstone, shale, conglomerate, and limestone (Cretaceous) at surface, covers < 0.1 % of this area
CONTINENTAL DEPOSITS OF SILTSTONE, SHALE, CONGLOMERATE, AND LIMESTONE-Includes units such as King Lear Formation in Humboldt County, Newark Canyon Formation in Eureka County, Willow Tank Formation and baseline Sandstone in Clark County
Lithology: conglomerate; sandstone; limestone; mudstone; siltstone
Igneous and metamorphic complex (Paleozoic sedimentary rocks with Mesozoic intrusive rocks) at surface, covers 2 % of this area
IGNEOUS AND METAMORPHIC COMPLEX-Pegmatitic granite and other granitic rocks complexly intermixed with metasedimentary rocks. Considered to be Mesozoic igneous complex intruding lower Paleozoic and possibly Precambrian Z sedimentary rocks. Grades into units shown on map as lower Paleozoic. Ruby Mountains and East Humboldt Range, Elko County
Lithology: marble; schist; gneiss; quartzite; granulite; dolostone (dolomite); granite; pegmatite
Diorite (Jurassic to Cretaceous) at surface, covers < 0.1 % of this area
Lithology: diorite; quartz diorite; gabbro; granite; granodiorite; serpentinite
Granitic rocks (Cretaceous) at surface, covers 0.7 % of this area
GRANITIC ROCKS-Mostly quartz monzonite and granodiorite
Lithology: granodiorite; quartz monzonite; granite; peraluminous granite
Volcanic sandstone, felsic ash-flow tuffs, rhyolite, and rhyodacite flows (Middle Jurassic to Early Cretaceous) at surface, covers < 0.1 % of this area
VOLCANIC SANDSTONE, FELSIC ASH-FLOW TUFFS, RHYOLITE, AND RHYODACITE FLOWS (Upper? Jurassic)-Pony Trail Group of Cortez Mountains, Eureka County
Lithology: quartz latite; ash-flow tuff; rhyolite; wacke; rhyodacite
Aztec Sandstone (Early Jurassic) at surface, covers < 0.1 % of this area
AZTEC SANDSTONE (Triassic? And Jurassic)-Friable fine- to medium-grained sandstone with conspicuous large-scale cross strata; considered eolian. Age based on correlation with Navajo Sandstone
Lithology: sandstone
Granitic rocks (Jurassic) at surface, covers 0.8 % of this area
GRANITIC ROCKS-Mostly quartz monzonite and granodiorite
Lithology: quartz monzonite; granodiorite; granite; monzonite; quartz diorite; peraluminous granite
Argillaceous limestone, chert, and shale (Devonian) at surface, covers < 0.1 % of this area
ARGILLACEOUS LIMESTONE, CHERT, AND SHALE-Elko and Eureka Counties
Lithology: limestone; shale; chert; siltstone; sandstone
Shale, siliceous siltstone, chert, and minor amounts of limestone (Devonian) at surface, covers < 0.1 % of this area
SHALE, SILICEOUS SILTSTONE, CHERT, AND MINOR AMOUNTS OF LIMESTONE-Includes Cockalorum Wash Formation of northern Nye County and Woodruff Formation and unnamed rocks in Elko County
Lithology: shale; chert; limestone; siltstone; dolostone (dolomite); sandstone
Chert, shale, argillite, siltstone, quartzite, and greenstone (Cambrian to Devonian) at surface, covers 0.5 % of this area
CHERT, SHALE, ARGILLITE, SILTSTONE, QUARTZITE, AND GREENSTONE-Undivided siliceous assemblage. Mostly Ordovician
Lithology: chert; quartzite; limestone; siltstone; conglomerate; shale
Dolomite and limestone (Middle Cambrian to Devonian) at surface, covers 0.4 % of this area
DOLOMITE AND LIMESTONE (Lower Paleozoic)
Lithology: marble; dolostone (dolomite); limestone; chert; quartzite
Dolomite, limestone, and minor amounts of sandstone and quartzite (Devonian) at surface, covers 1 % of this area
DOLOMITE, LIMESTONE, AND MINOR AMOUNTS OF SANDSTONE AND QUARTZITE-Includes units such as Sevy and Simonson Dolomites, Guilmette and Nevada Formations, and Devils Gate Limestone.
Lithology: dolostone (dolomite); limestone; sandstone; quartzite; conglomerate; shale; chert
Quartzite and minor amounts of conglomerate, phyllitic siltstone, limestone, and dolomite (Late Proterozoic to Early Cambrian) at surface, covers 0.3 % of this area
QUARTZITE AND MINOR AMOUNTS OF CONGLOMERATE, PHYLLITIC SILTSTONE, LIMESTONE, AND DOLOMITE-Includes Prospect Mountain Quartzite, Osgood Mountain Quartzite, and Gold Hill Formation in northern Nevada, and Stirling Quartzite, Wood Canyon Formation, and Zabriskie Quartzite in southern Nevada.
Lithology: quartzite; siltstone; dolostone (dolomite); limestone; phyllite; shale; conglomerate; sandstone
Shale and thin-bedded or laminated limestone; also thinly interbedded limestone and chert (Middle Cambrian to Late Cambrian) at surface, covers < 0.1 % of this area
SHALE AND THIN-BEDDED OR LAMINATED LIMESTONE; ALSO THINLY INTERBEDDED LIMESTONE AND CHERT-Includes units such as Preble and Emigrant Formations
Lithology: shale; limestone; chert; siltstone; quartzite; diorite; conglomerate
Limestone and dolomite, locally thick sequences of shale and siltstone (Late Cambrian to Middle Cambrian) at surface, covers 0.4 % of this area
LIMESTONE AND DOLOMITE, LOCALLY THICK SEQUENCES OF SHALE AND SILTSTONE-Includes units such as Pioche Shale, Eldorado Dolomite, Geddes Limestone, Secret Canyon Shale, Hamburg Dolomite, Dunderberg Shale, and Windfall Formation of northern Nevada and Carrara, Bonanza King, and Nopah Formations of southern Nevada.
Lithology: limestone; dolostone (dolomite); shale; siltstone; sandstone; chert; conglomerate
Siltstone, shale, and limestone; Early Triassic marine to non-marine epicontinental deposits; southeastern Idaho (Early Triassic) at surface, covers < 0.1 % of this area
Lower Triassic shallow-marine to non-marine sediments; limestone and chert above shaley sandstone, siltstone, and limestone of eastern Idaho.
Lithology: siltstone; shale; limetstone; chert; dolostone (dolomite)
Sandstone, conglomerate, siltstone, tuff, claystone, limestone, and diatomite; Pliocene tuffaceous alluvial and lacustrine deposits; Snake River Plain and vicinity, southeastern Idaho (Pliocene ) at surface, covers < 0.1 % of this area
Pliocene stream and lake deposits; may be due to volcanic and block-faulting events.
Lithology: sandstone; conglomerate; siltstone; tuff; claystone; shale; limestone
Basalt flows, pyroclastic debris, clastic sediments, and diatomite; Pliocene basaltic volcanics and clastic sediments; Snake River Plain and vicinity (Pliocene) at surface, covers < 0.1 % of this area
Pliocene olivine basalt flows and associated tuff and detritus of southern Idaho.
Lithology: basalt; lava flow; tuff; mixed clastic/volcanic
Rhyolite, quartz latite, and latite ignimbrites and flows; Miocene felsic volcanics; Owyhee Plateau; (Miocene) at surface, covers < 0.1 % of this area
Miocene silicic flows, tuffs; most common in southwestern Idaho.
Lithology: rhyolite; latite; quartz latite; ignimbrite; lava flow
Gravel, sand, and silt; Quaternary basin-filling alluvium; Snake River Plain, Basin and Range provinces (Quaternary) at surface, covers < 0.1 % of this area
Quaternary detritus; generally basin-filling deposits of central and southern Idaho.
Lithology: alluvium; alluvial fan; alluvial terrace
Limestone, sandstone, dolostone, and chert; Permian to Pennsylvanian marine epicontinental-basin deposits; southeastern Idaho; (Early Permian to Early Pennsylvanian) at surface, covers < 0.1 % of this area
Lower Permian to Lower Pennsylvanian chert, limestone, and sandstone of southern Idaho; subdivisions are (Ps, and PNs).
Lithology: limestone; sandstone; dolostone (dolomite); chert; siltstone; shale

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