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Geologic units in Storey county, Nevada

[Additional scientific data in this geographic area]

Welded and nonwelded silicic ash-flow tuffs (Early Oligocene to Early Miocene) at surface, covers 0.3 % 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 6 % 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
Rhyolitic intrusive rocks (Eocene to Miocene) at surface, covers 0.3 % of this area
RHYOLITIC INTRUSIVE ROCKS
Lithology: granitoid
Intrusive rocks of mafic to intermediate composition (Eocene to Miocene) at surface, covers 2 % of this area
INTRUSIVE ROCKS OF MAFIC TO INTERMEDIATE COMPOSITION
Lithology: diorite; monzodiorite; quartz diorite; quartz monzogabbro; tonalite; gabbro
Granitic rocks (Paleocene to Late Miocene) at surface, covers 0.1 % of this area
GRANITIC ROCKS-Mostly quartz monzonite and granodiorite
Lithology: granodiorite; quartz monzonite; granite; monzonite
Andesite and basalt flows (Early Miocene to Early Pliocene) at surface, covers 2 % 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 4 % of this area
BASALT FLOWS
Lithology: basalt
Andesite and related rocks of intermediate composition (Late Miocene to Middle Miocene) at surface, covers 3 % of this area
ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
Lithology: andesite; latite; trachyte; dacite
Rhyolitic flows and shallow intrusive rocks (Miocene to Quaternary) at surface, covers 0.1 % of this area
RHYOLITIC FLOWS AND SHALLOW INTRUSIVE ROCKS
Lithology: rhyolite; trachybasalt; latite; dacite; trachyte
Older alluvial deposits (Miocene to Quaternary) at surface, covers 1 % of this area
OLDER ALLUVIAL DEPOSITS
Lithology: alluvium; lake or marine deposit (non-glacial)
Basalt flows (Miocene to Quaternary) at surface, covers 4 % of this area
BASALT FLOWS-Locally includes maar deposits
Lithology: basalt; andesite; trachybasalt; latite; andesite
Intrusive rocks of mafic and intermediate composition (Miocene to Quaternary) at surface, covers 5 % of this area
INTRUSIVE ROCKS OF MAFIC AND INTERMEDIATE COMPOSITION
Lithology: andesite; rhyodacite; basalt; sedimentary rock
Alluvial deposits (Quaternary) at surface, covers 5 % of this area
ALLUVIAL DEPOSITS-Locally includes beach and sand dune deposits
Lithology: alluvium; mass wasting; dune sand; lake or marine deposit (non-glacial)
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
Shale, sandstone, volcanogenic clastic rocks, andesite, rhyolite, and locally thick carbonate units (Late Triassic to Early Cretaceous) at surface, covers 2 % of this area
SHALE, SANDSTONE, VOLCANOGENIC CLASTIC ROCKS, ANDESITE, RHYOLITE, AND LOCALLY THICK CARBONATE UNITS-Undivided sequence locally containing recognizable equivalents of the Luning and Dunlap Formations
Lithology: rhyolite; andesite; dacite; trachyte; argillite; shale; sandstone; siltstone; carbonate; basalt

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Page Last modified: 13:39 on 25-Apr-2014