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Geologic units in Washington county, Utah

[Additional scientific data in this geographic area]

Ash-flow tuffs and tuffaceous sedimentary rocks (Middle Miocene to Late Miocene) at surface, covers < 0.1 % of this area
ASH-FLOW TUFFS AND TUFFACEOUS SEDIMENTARY ROCKS
Lithology: ash-flow tuff; rhyolite; sandstone; dacite; trachyte
Mississippian (1) carbonate rocks in southwestern Utah (Mississippian) at surface, covers 0.6 % of this area
Lithology: limestone; dolostone (dolomite); chert
Rhyolitic flows and shallow intrusive rocks (Middle Miocene to Late Miocene) at surface, covers < 0.1 % of this area
RHYOLITIC FLOWS AND SHALLOW INTRUSIVE ROCKS
Lithology: rhyolite; dacite; trachyte
Pennsylvanian and Permian sedimentary rocks in southwestern Utah (Pennsylvanian) at surface, covers 1 % of this area
Lithology: dolostone (dolomite); sandstone
Jurassic (1) sedimentary rocks in southeastern Utah (Middle Jurassic) at surface, covers 3 % of this area
Lithology: sandstone; limestone; mudstone; evaporite
Miocene volcanic rocks (Late Oligocene to Middle Miocene) at surface, covers 10 % of this area
Lithology: ash-flow tuff; basalt
Tertiary (1) sedimentary rocks in southwestern Utah (Late Paleocene to Early Oligocene) at surface, covers 2 % of this area
Lithology: limestone; mudstone; fine-grained mixed clastic; conglomerate; tuff
Quaternary landslides (Quaternary) at surface, covers 0.1 % of this area
Lithology: landslide
Triassic (2) sedimentary rocks in southwestern Utah (Late Triassic) at surface, covers 6 % of this area
Lithology: mudstone; conglomerate; siltstone
Precambrian intrusive rocks in southwestern Utah (Precambrian) at surface, covers 0.3 % of this area
Lithology: granitoid
Permian (1) sedimentary rocks in southwestern Utah (Early Permian) at surface, covers 1.0 % of this area
Lithology: sandstone; dolostone (dolomite); fine-grained mixed clastic
Basalt flows (Late Miocene to Middle Miocene) at surface, covers < 0.1 % of this area
BASALT FLOWS
Lithology: basalt
Alluvial deposits (Quaternary) at surface, covers < 0.1 % of this area
ALLUVIAL DEPOSITS-Locally includes beach and sand dune deposits
Lithology: alluvium; mass wasting; dune sand; lake or marine deposit (non-glacial)
Quaternary eolian deposits (Quaternary) at surface, covers < 0.1 % of this area
Lithology: eolian
Middle Cambrian shale and carbonate rocks in southwestern Utah (Middle Cambrian) at surface, covers 0.4 % of this area
Lithology: dolostone (dolomite); argillite; limestone
Welded and nonwelded silicic ash-flow tuffs (Early Oligocene to Early Miocene) at surface, covers < 0.1 % 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
Quaternary alluvium and colluvium (Quaternary) at surface, covers 18 % of this area
Lithology: alluvium; colluvium
Tertiary volcanic rocks, undivided (Tertiary) at surface, covers 6 % of this area
Lithology: volcanic rock (aphanitic)
Permian (2) sedimentary rocks in southwestern Utah (Early Permian) at surface, covers 3 % of this area
Lithology: limestone; evaporite; chert
Pliocene and Quaternary alluvial material (Pliocene to Quaternary) at surface, covers 0.6 % of this area
Lithology: alluvium
Devonian sedimentary rocks in southewestern Utah (Devonian) at surface, covers 0.2 % of this area
Lithology: dolostone (dolomite); limestone; sandstone; shale
Older Quaternary alluvial deposits (Quaternary) at surface, covers 0.4 % of this area
Lithology: alluvium
Tertiary intrusive rocks in southwestern Utah (Oligocene to Miocene) at surface, covers 3 % of this area
Lithology: quartz monzonite; granite; monzonite
Triassic (1) sedimentary rocks in Salt southwestern Utah (Early Triassic) at surface, covers 7 % of this area
Lithology: mudstone; siltstone; limestone; sandstone; conglomerate; evaporite
Welded and nonwelded silicic ash-flow tuffs (Middle Miocene to Late Miocene) at surface, covers < 0.1 % of this area
WELDED AND NONWELDED SILICIC ASH-FLOW TUFFS-Locally includes thin units of air-fall tuff and sedimentary rock
Lithology: rhyolite
Andesite and related rocks of intermediate composition (Early Oligocene to Early Miocene) at surface, covers < 0.1 % of this area
ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
Lithology: andesite; trachyte; dacite
Older Precambrian metamorphic rocks in southwestern Utah (Precambrian) at surface, covers 0.4 % of this area
Lithology: schist; plutonic rock (phaneritic)
Cretaceous (2) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 4 % of this area
Lithology: sandstone; mudstone; black shale; coal
Quaternary basalts (Quaternary) at surface, covers 9 % of this area
Lithology: basalt; rhyolite
Pliocene to middle Miocene deposits (Middle Miocene to Pliocene) at surface, covers < 0.1 % of this area
Moderately to strongly consolidated conglomerate and sandstone deposited in basins during and after late Tertiary faulting. Includes lesser amounts of mudstone, siltstone, limestone, and gypsum. These deposits are generally light gray or tan. They commonly form high rounded hills and ridges in modern basins, and locally form prominent bluffs. Deposits of this unit are widely exposed in the dissected basins of southeastern and central Arizona. (2-16 Ma)
Lithology: conglomerate; sandstone; gravel; sand; gypsum; limestone; mudstone; siltstone
Cretaceous (1) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 1.0 % of this area
Lithology: sandstone; shale; conglomerate; coal
Tertiary (5) sedimentary rocks in southwestern Utah (Miocene to Pliocene) at surface, covers 0.1 % of this area
Lithology: sandstone; conglomerate
Early Pleistocene to latest Pliocene surficial deposits (Late Pliocene to Early Pleistocene) at surface, covers < 0.1 % of this area
Coarse relict alluvial fan deposits that form rounded ridges or flat, isolated surfaces that are moderately to deeply incised by streams. These deposits are generally topographically high and have undergone substantial erosion. Deposits are moderately to strongly consolidated, and commonly contain coarser grained sediment than younger deposits in the same area. (0.75-3 Ma)
Lithology: gravel; sand; mud; silt
Cambrian quartzite in southwestern Utah (Early to Middle Cambrian) at surface, covers < 0.1 % of this area
Lithology: arenite
Limestone and sparse dolomite, siltstone, and sandstone (Mississippian to Early Permian) at surface, covers < 0.1 % 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
Triassic and Jurassic sedimentary rocks in southwestern Utah (Early to Middle Jurassic) at surface, covers 18 % of this area
Lithology: sandstone; siltstone; mudstone; limestone
Cretaceous (3) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 0.3 % of this area
Lithology: fine-grained mixed clastic; siltstone
Oligocene volcanic rocks (Late Eocene to Oligocene) at surface, covers 0.2 % of this area
Lithology: dacite; rhyolite; andesite; basalt
Tuffaceous sedimentary rocks (Late Eocene to Late Miocene) at surface, covers < 0.1 % 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
Tertiary (4) sedimentary rocks in southwestern Utah (Miocene) at surface, covers 2 % of this area
Lithology: medium-grained mixed clastic; sandstone; conglomerate

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