Geologic units in Utah (state in United States)

[Additional scientific data in this geographic area]

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)
Pliocene basalts (Pliocene) at surface, covers 0.3 % of this area: Lithology: basalt; rhyolite
Triassic (1) sedimentary rocks in Salt western Utah (Early Triassic) at surface, covers < 0.1 % of this area: Lithology: siltstone; limestone
Tertiary (4) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Middle Miocene to Late Pliocene) at surface, covers < 0.1 % of this area: Lithology: medium-grained mixed clastic; alluvium; lake or marine deposit (non-glacial); pyroclastic; basalt; limestone
Cretaceous (3) sedimentary rocks in Uinta Mountains-Uinta Basin region (Late Cretaceous) at surface, covers 1 % of this area: Lithology: sandstone; shale; coal
Mississippian (2) sedimentary rocks in western Utah (Mississippian) at surface, covers 0.2 % of this area: Lithology: limestone; sandstone; dolostone (dolomite); shale
Cambrian quartzite in western Utah (Early Cambrian) at surface, covers 0.2 % of this area: Lithology: arenite; conglomerate
Upper Cambrian carbonate rocks in western Utah (Middle Cambrian to Early Ordovician) at surface, covers 0.4 % of this area: Lithology: limestone; dolostone (dolomite); shale
Permian (2) sedimentary rocks in southeastern Utah (Early Permian) at surface, covers < 0.1 % of this area: Lithology: limestone
Quaternary eolian deposits (Quaternary) at surface, covers 3 % of this area: Lithology: eolian
Jurassic (2) sedimentary rocks in southeastern Utah (Late Jurassic) at surface, covers 2 % of this area: Lithology: shale; sandstone; conglomerate
Jurassic (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Jurassic) at surface, covers < 0.1 % of this area: Lithology: mudstone
Cretaceous (1) sedimentary rocks in southeastern Utah (Cretaceous) at surface, covers 1 % of this area: Lithology: sandstone; shale
Younger Precambrian metamorphic rocks in Uinta Mountains-Uinta Basin region (Proterozoic Y) at surface, covers 1 % of this area: Lithology: arenite; shale; siltstone; mudstone; limestone; conglomerate
Triassic and Jurassic sedimentary rocks in southwestern Utah (Early to Middle Jurassic) at surface, covers 1 % of this area: Lithology: sandstone; siltstone; mudstone; limestone
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
Quaternary landslides (Quaternary) at surface, covers 0.5 % of this area: Lithology: landslide
Tertiary (1) sedimentary rocks in southeastern Utah (Late Paleocene to Early Eocene) at surface, covers 0.3 % of this area: Lithology: limestone; medium-grained mixed clastic; dolostone (dolomite)
Middle Cambrian shale and carbonate rocks in southwestern Utah (Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); argillite; limestone
Quaternary alluvium and colluvium (Quaternary) at surface, covers 16 % of this area: Lithology: alluvium; colluvium
Tertiary volcanic rocks, undivided (Tertiary) at surface, covers 0.7 % of this area: Lithology: volcanic rock (aphanitic)
Upper Cambrian carbonate rocks in central Utah (Middle Cambrian to Early Ordovician) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); limestone; shale; chert
Triassic and Jurassic sedimentary rocks in Uinta Mountains-Uinta Basin region (Early Jurassic) at surface, covers 0.1 % of this area: Lithology: sandstone
Mississippian (1) carbonate rocks in southwestern Utah (Mississippian) at surface, covers < 0.1 % of this area: Lithology: limestone; dolostone (dolomite); chert
Silurian carbonate rocks in western Utah (Silurian) at surface, covers 0.1 % of this area: Lithology: dolostone (dolomite); chert
Triassic (1) sedimentary rocks in Logan-Huntsville Allochthon (Early Triassic) at surface, covers < 0.1 % of this area: Lithology: limestone; siltstone; mudstone
Permian (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Permian) at surface, covers 0.1 % of this area: Lithology: sandstone; carbonate; fine-grained mixed clastic; phosphorite
Cretaceous (3) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous) at surface, covers < 0.1 % of this area: Lithology: conglomerate; sandstone; siltstone; mudstone
Miocene volcanic rocks (Late Oligocene to Middle Miocene) at surface, covers 3 % of this area: Lithology: ash-flow tuff; basalt
Miocene rhyolites (Middle to Late Miocene) at surface, covers 0.3 % of this area: Lithology: rhyolite; dacite
Quaternary glacial deposits (Quaternary) at surface, covers 2 % of this area: Lithology: glacial drift
Tertiary (3) sedimentary rocks in Uinta Mountains-Uinta Basin region (Middle Eocene to Early Oligocene) at surface, covers 4 % of this area: Lithology: sandstone; mudstone; siltstone; pyroclastic
Mississippian (1) carbonate rocks in Logan-Huntsville Allochthon (Mississippian) at surface, covers < 0.1 % of this area: Lithology: limestone
Quaternary mud and salt flats (Holocene) at surface, covers 5 % of this area: Lithology: mud flat; playa
Cretaceous (2) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 2 % of this area: Lithology: sandstone; mudstone; black shale; coal
Quaternary basalts (Quaternary) at surface, covers 0.8 % of this area: Lithology: basalt; rhyolite
Devonian sedimentary rocks in central Utah (Devonian) at surface, covers < 0.1 % of this area: Lithology: limestone; sandstone; dolostone (dolomite)
Tertiary (4) sedimentary rocks in Logan-Huntsville Allochthon (Middle Miocene to Late Pliocene) at surface, covers 0.2 % of this area: Lithology: mudstone; sandstone
Younger Precambrian metamorphic rocks in Salt Lake City-Coalville-Randolph region (Proterozoic Y to Proterozoic Z) at surface, covers < 0.1 % of this area: Lithology: medium-grained mixed clastic
Older Quaternary alluvial deposits (Quaternary) at surface, covers 4 % of this area: Lithology: alluvium
Devonian sedimentary rocks in Salt Lake City-Coalville-Randolph region (Devonian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); sandstone
Miocene basalts (Early to Middle Miocene) at surface, covers < 0.1 % of this area: Lithology: basalt
Mississippian (1) carbonate rocks in western Utah (Mississippian) at surface, covers < 0.1 % of this area: Lithology: limestone
Tertiary (4) sedimentary rocks in western Utah (Middle Miocene to Late Pliocene) at surface, covers 0.4 % of this area: Lithology: coarse-grained mixed clastic; alluvium; pyroclastic; basalt; evaporite
Cretaceous and Tertiary sedimentary rocks in central Utah (Late Cretaceous to Eocene) at surface, covers 0.3 % of this area: Lithology: fine-grained mixed clastic; sandstone; conglomerate; limestone
Cretaceous and Tertiary sedimentary rocks in southeastern Utah (Late Cretaceous to Paleocene) at surface, covers 0.7 % of this area: Lithology: fine-grained mixed clastic; sandstone; conglomerate
Tertiary intrusive rocks in central Utah (Late Eocene to Oligocene) at surface, covers < 0.1 % of this area: Lithology: granodiorite; monzonite; quartz monzonite; monzodiorite; granite; diorite; quartz diorite; quartz monzodiorite
Devonian sedimentary rocks in western Utah (Devonian to Mississippian) at surface, covers 0.4 % of this area: Lithology: dolostone (dolomite); limestone; siltstone; mudstone
Pennsylvanian and Permian sedimentary rocks in northwestern Utah (Pennsylvanian to Permian) at surface, covers < 0.1 % of this area: Lithology: limestone; sandstone
Jurassic (1) sedimentary rocks in central Utah (Middle Jurassic) at surface, covers 0.1 % of this area: Lithology: mudstone; sandstone; limestone; evaporite
Middle Cambrian shale and carbonate rocks in Logan-Huntsville Allochthon (Middle Cambrian) at surface, covers 0.2 % of this area: Lithology: dolostone (dolomite); shale; limestone
Ordovician sedimentary rocks in central Utah (Ordovician) at surface, covers < 0.1 % of this area: Lithology: limestone; dolostone (dolomite)
Middle Cambrian shale and carbonate rocks in central Utah (Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); limestone; shale
Permian (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Permian) at surface, covers < 0.1 % of this area: Lithology: limestone; siltstone; sandstone; shale; phosphorite
Quaternary rhyolites (Quaternary) at surface, covers < 0.1 % of this area: Lithology: rhyolite
Triassic (2) sedimentary rocks in southeastern Utah (Late Triassic) at surface, covers 0.9 % of this area: Lithology: mudstone; sandstone; siltstone; conglomerate; limestone
Pennsylvanian and Permian sedimentary rocks in central Utah (Pennsylvanian to Permian) at surface, covers 0.7 % of this area: Lithology: sandstone; limestone; medium-grained mixed clastic
Triassic (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Late Triassic) at surface, covers < 0.1 % of this area: Lithology: shale; siltstone; sandstone; conglomerate
Baxter Shale (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area: BAXTER SHALE--Gray to black soft sandy shale and shaly sandstone.
Lithology: shale; sandstone
Pennsylvanian and Permian sedimentary rocks in Uinta Mountains-Uinta Basin region (Pennsylvanian to Permian) at surface, covers 0.2 % of this area: Lithology: arenite
Pliocene and Quaternary alluvial material (Pliocene to Quaternary) at surface, covers 0.5 % of this area: Lithology: alluvium
Moenkopi Formation (Early and Middle(?) Triassic) at surface, covers < 0.1 % of this area: Dark red sandstone and mudstone; includes gypsum beds in northwestern Arizona; deposited on a low-relief coastal plain. (230-245 Ma)
Lithology: mudstone; sandstone; orthoquartzite; siltstone; arenite; claystone; conglomerate; dolostone (dolomite); gypsum; limestone; sedimentary breccia
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 < 0.1 % of this area: Lithology: dolostone (dolomite); sandstone
Mississippian (1) carbonate rocks in Uinta Mountains-Uinta Basin region (Mississippian) at surface, covers 0.1 % of this area: Lithology: limestone
Triassic and Jurassic sedimentary rocks in central Utah (Early Jurassic) at surface, covers < 0.1 % of this area: Lithology: sandstone
Cretaceous (2) sedimentary rocks in southeastern Utah (Late Cretaceous) at surface, covers 3 % of this area: Lithology: shale; sandstone; limestone
Pennsylvanian sedimentary rocks in Uinta Mountains-Uinta Basin region (Pennsylvanian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); sandstone
Mesaverde Group, Rock Springs Formation (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area: MESAVERDE GROUP (SOUTH WYOMING). Rock Springs uplift. Rock Springs Formation--White to brown sandstone, shale, and claystone; numerous coal beds.
Lithology: sandstone; mudstone; coal
Triassic (2) sedimentary rocks in central Utah (Middle to Late Triassic) at surface, covers < 0.1 % of this area: Lithology: mudstone; siltstone; sandstone; conglomerate; evaporite
Pennsylvanian and Permian sedimentary rocks in western Utah (Pennsylvanian to Permian) at surface, covers 0.6 % of this area: Lithology: sandstone; limestone
Upper Cambrian carbonate rocks in Logan-Huntsville Allochthon (Middle Cambrian to Early Ordovician) at surface, covers 0.1 % of this area: Lithology: dolostone (dolomite); arenite; siltstone; mudstone; limestone
Cambrian quartzite in Salt Lake City-Coalville-Randolph region (Early to Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: arenite; conglomerate
Tertiary (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Eocene) at surface, covers 3 % of this area: Lithology: shale; limestone; oil shale; fine-grained mixed clastic; tuff
Jurassic intrusive rocks in western Utah (Jurassic) at surface, covers < 0.1 % of this area: Lithology: granodiorite; monzodiorite; monzonite; quartz monzonite; diorite; granite; aplite
Pennsylvanian and Permian sedimentary rocks in Logan-Huntsville Allochthon (Pennsylvanian to Permian) at surface, covers 0.4 % of this area: Lithology: sandstone; carbonate
Cretaceous (1) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 0.2 % of this area: Lithology: sandstone; shale; conglomerate; coal
Morrison Formation (Phanerozoic | Mesozoic | Jurassic) at surface, covers < 0.1 % of this area: Morrison Formation; Upper Jurassic nonmarine rocks present only in northern one-third of state
Lithology: fine-grained mixed clastic; limestone
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
Tertiary (5) sedimentary rocks in southwestern Utah (Miocene to Pliocene) at surface, covers 0.2 % of this area: Lithology: sandstone; conglomerate
Pennsylvanian and Permian sedimentary rocks in southeastern Utah (Pennsylvanian to Permian) at surface, covers 0.3 % of this area: Lithology: limestone; sandstone
Modern alluvium (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area: Includes Piney Creek Alluvium and younger deposits
Lithology: alluvium
Middle Cambrian shale and carbonate rocks in western Utah (Middle Cambrian) at surface, covers 0.3 % of this area: Lithology: limestone; shale; dolostone (dolomite); argillite
Jurassic (2) sedimentary rocks in central Utah (Late Jurassic) at surface, covers < 0.1 % of this area: Lithology: conglomerate; fine-grained mixed clastic
Mississippian (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Mississippian) at surface, covers < 0.1 % of this area: Lithology: sandstone; limestone; shale; dolostone (dolomite)
Cretaceous and Tertiary sedimentary rocks in southwestern Utah (Late Cretaceous to Paleocene) at surface, covers < 0.1 % of this area: Lithology: coarse-grained mixed clastic; sandstone
Devonian sedimentary rocks in Logan-Huntsville Allochthon (Devonian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); sandstone; siltstone; mudstone
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
Jurassic (1) sedimentary rocks in southeastern Utah (Middle Jurassic) at surface, covers 0.6 % of this area: Lithology: sandstone; limestone; mudstone; evaporite
Miocene andesites (Tertiary) at surface, covers < 0.1 % of this area: Lithology: andesite
Cretaceous and Tertiary sedimentary rocks in Uinta Mountains-Uinta Basin region (Late Cretaceous to Paleocene) at surface, covers 0.2 % of this area: Lithology: conglomerate; sandstone; fine-grained mixed clastic; limestone; coal
Quaternary marshes (Holocene) at surface, covers 0.5 % of this area: Lithology: biogenic sediment
Oligocene volcanic rocks (Late Eocene to Oligocene) at surface, covers 2 % of this area: Lithology: dacite; rhyolite; andesite; basalt
Tertiary (1) sedimentary rocks in central Utah (Late Paleocene to Early Eocene) at surface, covers 0.4 % of this area: Lithology: limestone; mudstone; fine-grained mixed clastic; dolostone (dolomite)
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
Cretaceous (2) sedimentary rocks in central Utah (Cretaceous) at surface, covers 0.1 % of this area: Lithology: sandstone; mudstone; conglomerate; coal
Wasatch Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area: WASATCH FORMATION -- in Thrust belt: Main body--Variegated red to gray, brown, and gray mudstone and sandstone; conglomeratic lenses; in southwest Wyoming--Drab to variegated claystone and siltstone, carbonaceous shale and coal, buff sandstone, arkose, and conglomerate. In northwestern part of Green River Basin is thick arkosic light-yellowish-tan sandstone intertonguing with pale-green to gray claystone and shale; in east Wyoming--Drab sandstone and drab to variegated claystone; numerous coal beds in lower part.
Lithology: mudstone; sandstone; conglomerate; coal
Limestone, dolostone, arenite, shale, and siltstone; Lower Paleozoic marine continental-shelf deposits; southeastern Idaho; (Early Paleozoic) at surface, covers < 0.1 % of this area: Lower Paleozoic marine carbonate and clastic units southeast of the Snake Plain.
Lithology: limestone; dolostone (dolomite); arenite; shale; siltstone
Tertiary (1) sedimentary rocks in Uinta Mountains-Unita Basin region (Early to Middle Eocene) at surface, covers 1 % of this area: Lithology: fine-grained mixed clastic; limestone; coal
Triassic (1) sedimentary rocks in Salt Uinta Mountains-Uinta Basin region (Early Triassic) at surface, covers < 0.1 % of this area: Lithology: mudstone; siltstone; sandstone; evaporite; limestone
Tertiary intrusive rocks in southeastern Utah (Oligocene) at surface, covers 0.1 % of this area: Lithology: diorite; monzodiorite; quartz monzodiorite; quartz diorite; syenite; granite
Permian (2) sedimentary rocks in western Utah (Permian) at surface, covers 0.2 % of this area: Lithology: carbonate; fine-grained mixed clastic; chert
Cambrian quartzite in central Utah (Early to Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: arenite; conglomerate
Tertiary (4) sedimentary rocks in southwestern Utah (Miocene) at surface, covers 0.1 % of this area: Lithology: medium-grained mixed clastic; sandstone; conglomerate
Permian (1) sedimentary rocks in central Utah (Early Permian) at surface, covers < 0.1 % of this area: Lithology: sandstone; limestone
Mississippian (1) carbonate rocks in Salt Lake City-Coalville-Randolph region (Mississippian) at surface, covers < 0.1 % of this area: Lithology: limestone
Quaternary Lake Bonneville deposits (Quaternary) at surface, covers 7 % of this area: Lithology: clay or mud; sand; gravel; silt
Cretaceous (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Early Cretaceous) at surface, covers < 0.1 % of this area: Lithology: sandstone; shale; siltstone
Wasatch Fm (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area: Claystone, shale, and sandstone
Lithology: claystone; shale; sandstone
Tertiary (4) sedimentary rocks in central Utah (Middle Miocene to Late Pliocene) at surface, covers 0.3 % of this area: Lithology: medium-grained mixed clastic; alluvium; limestone; pyroclastic
Weber Sandstone (Phanerozoic | Paleozoic | Carboniferous Pennsylvanian Permian) at surface, covers < 0.1 % of this area: Lithology: sandstone
Ordovician sedimentary rocks in western Utah (Ordovician) at surface, covers 0.3 % of this area: Lithology: limestone; fine-grained mixed clastic; sandstone; dolostone (dolomite)
Triassic (1) sedimentary rocks in Salt southwestern Utah (Early Triassic) at surface, covers 0.3 % of this area: Lithology: mudstone; siltstone; limestone; sandstone; conglomerate; evaporite
Tertiary (1) sedimentary rocks in southwestern Utah (Late Paleocene to Early Oligocene) at surface, covers 0.7 % of this area: Lithology: limestone; mudstone; fine-grained mixed clastic; conglomerate; tuff
Uinta Mountain Group (Proterozoic | Mesoproterozoic) at surface, covers < 0.1 % of this area: Quartzite, conglomerate, and shale
Lithology: quartzite; conglomerate; shale
Tertiary (3) sedimentary rocks in southeastern Utah (Eocene) at surface, covers < 0.1 % of this area: Lithology: sandstone; mudstone; limestone
Tertiary (4) sedimentary rocks in Uinta Mountains-Uinta Basin region (Oligocene) at surface, covers 0.6 % of this area: Lithology: conglomerate
Moenkopi Fm and Cutler Fm (Phanerozoic | Paleozoic Mesozoic | Permian Triassic) at surface, covers < 0.1 % of this area: Red siltstone and sandstone
Lithology: siltstone; sandstone
Older gravels and alluviums (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area: Includes Slocum, Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida, Bridgetimber, and Bayfield Gravels in southwest
Lithology: gravel; alluvium
Silurian carbonate rocks in central Utah (Late Ordovician to Silurian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite)
Younger Precambrian metamorphic rocks in central Utah (Proterozoic Z) at surface, covers < 0.1 % of this area: Lithology: sandstone; conglomerate; limestone
Permian (1) sedimentary rocks in southwestern Utah (Early Permian) at surface, covers < 0.1 % of this area: Lithology: sandstone; dolostone (dolomite); fine-grained mixed clastic
Cretaceous (3) sedimentary rocks in southeastern Utah (Late Cretaceous) at surface, covers 0.7 % of this area: Lithology: shale; sandstone; coal; black shale
Permian (2) sedimentary rocks in central Utah (Permian) at surface, covers < 0.1 % of this area: Lithology: limestone; mudstone; sandstone; phosphorite; dolostone (dolomite)
Mississippian (1) carbonate rocks in central Utah (Late Devonian to Mississippian) at surface, covers < 0.1 % of this area: Lithology: limestone; dolostone (dolomite)
Younger Precambrian metamorphic rocks in Logan-Huntsville Allochthon (Proterozoic Z) at surface, covers < 0.1 % of this area: Lithology: arenite; fine-grained mixed clastic; conglomerate; basalt
Triassic and Jurassic sedimentary rocks in western Utah (Early Jurassic) at surface, covers < 0.1 % of this area: Lithology: sandstone
Permian (1) sedimentary rocks in western Utah (Early Permian) at surface, covers 0.3 % of this area: Lithology: sandstone; carbonate; fine-grained mixed clastic; evaporite
Tertiary (5) sedimentary rocks in Uinta Mountains-Uinta Basin region (Miocene) at surface, covers < 0.1 % of this area: Lithology: sandstone; conglomerate; volcanic rock (aphanitic); limestone; chert
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
Permian (2) sedimentary rocks in southwestern Utah (Early Permian) at surface, covers 0.2 % of this area: Lithology: limestone; evaporite; chert
Precambrian intrusive rocks in northwestern Utah (Archean) at surface, covers < 0.1 % of this area: Lithology: quartz monzonite; quartz monzodiorite
Browns Park Fm (Phanerozoic | Cenozoic | Tertiary) at surface, covers < 0.1 % of this area: Sandstone and siltstone; west of Park Range
Lithology: sandstone; siltstone
Cretaceous (3) sedimentary rocks in southwestern Utah (Late Cretaceous) at surface, covers 0.3 % of this area: Lithology: fine-grained mixed clastic; siltstone
Cambrian quartzite in Uinta Mountains-Uinta Basin area (Early to Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: sandstone; shale; conglomerate
Jurassic (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Middle to Late Jurassic) at surface, covers < 0.1 % of this area: Lithology: limestone; sandstone; fine-grained mixed clastic; evaporite
Triassic (2) sedimentary rocks in southwestern Utah (Late Triassic) at surface, covers 0.2 % of this area: Lithology: mudstone; conglomerate; siltstone
Younger Precambrian metamorphic rocks in western Utah (Precambrian) at surface, covers 0.2 % of this area: Lithology: conglomerate; metamorphic rock
Cretaceous (3) sedimentary rocks in central Utah (Late Cretaceous) at surface, covers < 0.1 % of this area: Lithology: sandstone; mudstone; conglomerate
Triassic (1) sedimentary rocks in Salt central Utah (Early Triassic) at surface, covers < 0.1 % of this area: Lithology: siltstone; mudstone; limestone; sandstone
Cretaceous (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Late Cretaceous) at surface, covers 0.2 % of this area: Lithology: shale; sandstone
Pennsylvanian sedimentary rocks in central Utah (Pennsylvanian) at surface, covers < 0.1 % of this area: Lithology: limestone; fine-grained mixed clastic
Triassic and Jurassic sedimentary rocks in Salt Lake City-Coalville-Randolph region (Early Jurassic) at surface, covers < 0.1 % of this area: Lithology: sandstone
Triassic (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Middle to Late Triassic) at surface, covers < 0.1 % of this area: Lithology: shale; siltstone; conglomerate
Migmatite, or injection gneiss; Oligocene granite in Late Proterozoic metasedimentary rocks; south-central Idaho, Albion Range metamorphic core complex (Oligocene and Cambrian to Late Proterozoic, mixed) at surface, covers < 0.1 % of this area: Eocene intrusions including large granitic plutons and dike swarms of central Idaho
Lithology: migmatite
Younger Precambrian metamorphic rocks in northwestern Utah (Proterozoic X) at surface, covers 0.2 % of this area: Lithology: schist; quartzite
Alluvium and Colluvium (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area: ALLUVIUM AND COLLUVIUM--Clay, silt, sand, and gravel in flood plains, fans, terraces, and slopes.
Lithology: alluvium; colluvium
Tertiary (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Paleocene to Early Eocene) at surface, covers 0.7 % of this area: Lithology: mudstone; conglomerate; limestone
Tertiary (2) sedimentary rocks in central Utah (Eocene) at surface, covers 0.2 % of this area: Lithology: shale; limestone; oil shale; fine-grained mixed clastic; tuff
Bishop Conglomerate (Phanerozoic | Cenozoic | Tertiary | Oligocene ) at surface, covers < 0.1 % of this area: BISHOP CONGLOMERATE--Clasts of red quartzite, gray chert, and limestone in a gray to white tuffaceous sandstone matrix.
Lithology: conglomerate
Older Precambrian metamorphic rocks in northwestern Utah (Archean) at surface, covers < 0.1 % of this area: Lithology: metamorphic rock
Upper Cambrian carbonate rocks in Salt Lake City-Coalville-Randolph region (Middle Cambrian to Early Ordovician) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); sandstone
Mississippian (3) sedimentary rocks in Uinta Mountains-Uinta Basin region (Mississippian) at surface, covers < 0.1 % of this area: Lithology: shale; limestone; coal
Mississippian (2) sedimentary rocks in Logan-Huntsville Allochthon (Mississippian) at surface, covers < 0.1 % of this area: Lithology: carbonate; sandstone; mudstone; phosphorite
Tertiary (1) sedimentary rocks in Logan-Huntsville Allochthon (Late Cretaceous to Early Eocene) at surface, covers 1 % of this area: Lithology: conglomerate; medium-grained mixed clastic
Ordovician sedimentary rocks in Logan-Huntsville Allochthon (Ordovician) at surface, covers 0.1 % of this area: Lithology: limestone; arenite; dolostone (dolomite); chert; conglomerate
Tertiary intrusive rocks in southwestern Utah (Oligocene to Miocene) at surface, covers 0.2 % of this area: Lithology: quartz monzonite; granite; monzonite
Landslide deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area: Locally includes talus, rock-glacier, and thick colluvial deposits
Lithology: landslide; talus; colluvium
Mississippian (3) sedimentary rocks in central Utah (Mississippian) at surface, covers < 0.1 % of this area: Lithology: shale; limestone
Park City Fm (Phanerozoic | Paleozoic | Permian) at surface, covers < 0.1 % of this area: Calcareous siltstone and sandstone
Lithology: siltstone; sandstone
Cretaceous and Tertiary sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous to Paleocene) at surface, covers 0.2 % of this area: Lithology: sandstone; mudstone; coal
Cambrian quartzite in Logan-Huntsville Allochthon (Early to Middle Cambrian) at surface, covers 0.1 % of this area: Lithology: arenite; conglomerate; siltstone; mudstone
Pennsylvanian sedimentary rocks in Salt Lake City-Coalville-Randolph region (Pennsylvanian) at surface, covers < 0.1 % of this area: Lithology: limestone; medium-grained mixed clastic; chert
Older Precambrian metamorphic rocks in Logan-Huntsville Allochthon (Proterozoic X) at surface, covers < 0.1 % of this area: Lithology: quartzite; schist; marble; amphibolite
Mississippian (2) sedimentary rocks in central Utah (Mississippian) at surface, covers 0.2 % of this area: Lithology: limestone; sandstone; mudstone; phosphorite
Jurassic (1) sedimentary rocks in Uinta Mountains-Uinta Basin region (Middle to Late Jurassic) at surface, covers < 0.1 % of this area: Lithology: sandstone; mudstone; limestone; evaporite
Cretaceous (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous) at surface, covers 0.1 % of this area: Lithology: sandstone; shale; conglomerate
Tertiary intrusive rocks in Salt Lake City-Coalville-Randolph region (Late Eocene to Oligocene) at surface, covers < 0.1 % of this area: Lithology: granodiorite; quartz monzonite; granite; diorite
Evanston Formation (Phanerozoic | Mesozoic Cenozoic | Cretaceous-Late Tertiary | Paleocene) at surface, covers < 0.1 % of this area: EVANSTON FORMATION--Gray siltstone, sparse red sandstone, and lignite beds.
Lithology: siltstone; sandstone; coal
Fort Union Formation (Phanerozoic | Cenozoic | Tertiary | Paleocene ) at surface, covers < 0.1 % of this area: FORT UNION FORMATION northwest, southwest, and central Wyoming--Brown to gray sandstone, gray to black shale, and thin coal beds; east Wyoming--Light-colored massive sandstone, drab shale, and thick coal beds.
Lithology: sandstone; shale; coal
Triassic (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Early Triassic) at surface, covers < 0.1 % of this area: Lithology: mudstone; limestone; siltstone; sandstone; evaporite
Precambrian intrusive rocks in southwestern Utah (Precambrian) at surface, covers < 0.1 % of this area: Lithology: granitoid
Pennsylvanian sedimentary rocks in western Utah (Mississippian to Pennsylvanian) at surface, covers < 0.1 % of this area: Lithology: limestone; chert
Pliocene rhyolites (Pliocene) at surface, covers < 0.1 % of this area: Lithology: rhyolite
Salt Lake Formation (Phanerozoic | Cenozoic | Tertiary | Miocene Pliocene) at surface, covers < 0.1 % of this area: SALT LAKE FORMATION--White, gray, and green limy tuff, siltstone, sandstone, and conglomerate.
Lithology: fine-grained mixed clastic; medium-grained mixed clastic; mixed clastic/carbonate; mixed clastic/volcanic
Basalt flows (Late Miocene to Middle Miocene) at surface, covers < 0.1 % of this area: BASALT FLOWS
Lithology: basalt
Gravel, sand, and silt; Quaternary; alluvium (Quaternary) at surface, covers < 0.1 % of this area: Quaternary alluvium; may contain some glacial deposits and colluvium in uplands
Lithology: alluvium; alluvial terrace; floodplain; alluvial fan; colluvium
Tertiary (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Eocene) at surface, covers < 0.1 % of this area: Lithology: fine-grained mixed clastic; conglomerate; tuff; limestone
Silurian carbonate rocks in Logan-Huntsville Allochthon (Silurian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite)
Permian (2) sedimentary rocks in Logan-Huntsville Allochthon (Permian) at surface, covers < 0.1 % of this area: Lithology: limestone; shale; phosphorite; chert; dolostone (dolomite)
Holocene surficial deposits (Holocene) at surface, covers < 0.1 % of this area: Unconsolidated deposits associated with modern fluvial systems. This unit consists primarily of fine-grained, well-sorted sediment on alluvial plains, but also includes gravelly channel, terrace, and alluvial fan deposits on middle and upper piedmonts. (0-10 ka)
Lithology: sand; gravel; mud; silt
Morrison Formation (Late Jurassic) at surface, covers < 0.1 % of this area: Commonly cliff-forming, cross-bedded sandstone lenses alternating with slope-forming siltstone, mudstone and shale. Colors are highly variable, and include greenish gray, reddish brown, pink, white, and purple. Sands were deposited by braided streams with finer sediment representing overbank or lacustrine deposits. (145-160 Ma)
Lithology: mudstone; sandstone; siltstone; conglomerate
Middle Cambrian shale and carbonate rocks in Salt Lake City-Coalville-Randolph region (Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: carbonate; shale; sandstone
Cretaceous (2) sedimentary rocks in western Utah (Late Cretaceous) at surface, covers < 0.1 % of this area: Lithology: sandstone; mudstone; conglomerate
Dolostone, limestone, arenite, chert, and conglomerate; Ordovician marine continental-shelf deposits; southeastern Idaho (Ordovician) at surface, covers < 0.1 % of this area: Ordovician marine dolomite, quartzite, and limestone; subdivisions are (Ou and Ol).
Lithology: dolostone (dolomite); limestone; arenite; chert; conglomerate
Mississippian (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Mississippian) at surface, covers < 0.1 % of this area: Lithology: carbonate; sandstone; chert; phosphorite
Sage Junction, Quealy, Cokeville, THomas Fork, and Smiths Formations (Phanerozoic | Mesozoic | Cretaceous-Early) at surface, covers < 0.1 % of this area: SAGE JUNCTION, QUEALY, COKEVILLE, THOMAS FORK, AND SMITHS FORMATIONS. SAGE JUNCTION FORMATION--Gray and tan siltstone and sandstone. QUEALY FORMATION--Variegated mudstone and tan sandstone. COKEVILLE FORMATION--Tan sandstone, claystone, limestone, bentonite, and coal. THOMAS FORK FORMATION--Variegated mudstone and gray sandstone. SMITHS FORMATION--Ferruginous black shale and tan to brown sandstone.
Lithology: mudstone; sandstone; limestone; bentonite; coal
Quartzite, mica schist, and marble; Cambrian and Late Proterozoic metasedimentary rocks; south-central Idaho, Albion-Range metamorphic core complex (Cambrian to Late Proterozoic) at surface, covers < 0.1 % of this area: Schist, quartzite and other metasediments of probable Lower Ordovician to Cambrian age.
Lithology: quartzite; mica schist; marble
Tertiary (3) sedimentary rocks in central Utah (Late Eocene to Early Oligocene) at surface, covers 0.1 % of this area: Lithology: sandstone; mudstone; siltstone; conglomerate
Clay, silt, sand, and gravel; Late Pleistocene glacial-lake sediments; Basin and Range province (Late Pleistocene) at surface, covers < 0.1 % of this area: Pleistocene glacial-lake, ponded-water, and shoreline sediments.
Lithology: glaciolacustrine; silt; sand; gravel
Older Precambrian metamorphic rocks in Salt Lake City-Coalville-Randolph region (Archean) at surface, covers 0.2 % of this area: Lithology: metamorphic rock; plutonic rock (phaneritic)
Tertiary (2) sedimentary rocks in southwestern Utah (Eocene) at surface, covers < 0.1 % of this area: Lithology: shale; limestone; oil shale; fine-grained mixed clastic; tuff
Wasatch Formation (SW) (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers < 0.1 % of this area: WASATCH FORMATION Main body--Drab sandstone, drab to variegated claystone and siltstone; locally derived conglomerate around basin margins. Lower part is Paleocene.
Lithology: sandstone; fine-grained mixed clastic; conglomerate
Bridger Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area: BRIDGER FORMATION--Greenish-gray, olive-drab, and white tuffaceous sandstone and claystone; lenticular marlstone and conglomerate.
Lithology: fine-grained mixed clastic; mixed clastic/volcanic; mixed clastic/carbonate
Jurassic (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Late Jurassic) at surface, covers < 0.1 % of this area: Lithology: shale; sandstone; limestone; conglomerate
Cretaceous (1) sedimentary rocks in Uinta Mountains-Uinta Basin region (Cretaceous) at surface, covers < 0.1 % of this area: Lithology: sandstone; shale
Morrison Fm, Summerville Fm, and Entrada Sandstone (Phanerozoic | Mesozoic | Jurassic) at surface, covers < 0.1 % of this area: Summerville Fm: Shale and siltstone
Lithology: mudstone; sandstone
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
Triassic and Jurassic sedimentary rocks in southeastern Utah (Early Jurassic) at surface, covers 4 % of this area: Lithology: sandstone; mudstone; limestone
Triassic (2) sedimentary rocks in western Utah (Late Triassic) at surface, covers < 0.1 % of this area: Lithology: shale; siltstone; sandstone; conglomerate; basalt
Eolian deposits (Phanerozoic | Cenozoic | Quaternary) at surface, covers < 0.1 % of this area: Includes dune sand and silt and Peoria Loess
Lithology: dune sand; silt; loess
Arenite, carbonate, conglomerate, and shale; Late Proterozoic rifted continental margin; southeastern Idaho (Late Proterozoic) at surface, covers < 0.1 % of this area: Uppermost Younger Precambrian massive quartzite with carbonate beds of central and southeastern Idaho; overlies (Z1s).
Lithology: arenite; carbonate; conglomerate; shale
Jurassic (1) sedimentary rocks in southeastern Utah (Middle to Late Jurassic) at surface, covers 3 % of this area: Lithology: sandstone; mudstone; limestone; evaporite
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
Andesite and related rocks of intermediate composition (Late Eocene to Middle Eocene) at surface, covers < 0.1 % of this area: ANDESITE AND RELATED ROCKS OF INTERMEDIATE COMPOSITION-Flows and breccias
Lithology: andesite; latite
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
Older Precambrian metamorphic rocks in western Utah (Precambrian) at surface, covers < 0.1 % of this area: Lithology: metamorphic rock
playa (Holocene) at surface, covers 0.2 % of this area: Lithology: playa
Fowkes Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area: FOWKES FORMATION--Light-colored tuffaceous sandstone and siltstone, locally conglomeratic. Locally designated by some as Norwood Tuff.
Lithology: fine-grained mixed clastic; medium-grained mixed clastic; mixed clastic/volcanic
Cambrian quartzite in northwestern Utah (Cambrian?) at surface, covers < 0.1 % of this area: Lithology: schist; quartzite
Glacial debris; Late Pleistocene glacial till, outwash, and alluvium of continental glaciers; northern Idaho (Late Pleistocene ) at surface, covers < 0.1 % of this area: Pleistocene till, moraines and similar unsorted glacial debris.
Lithology: till; outwash; alluvium
Cretaceous (2) sedimentary rocks in Logan-Huntsville Allochthon (Late Cretaceous) at surface, covers < 0.1 % of this area: Lithology: sandstone; siltstone; mudstone
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
Morrison, Curtis, and Entrada Fms (Phanerozoic | Mesozoic | Jurassic) at surface, covers < 0.1 % of this area: In extreme southwestern Moffat County, includes thin wedge of Carmel Fm (red siltstone and sandstone) beneath Entrada
Lithology: mudstone; sandstone
Clastic debris; Quaternary colluvium, fanglomerate, talus, and glacial deposits; upland-valley margins (Quaternary) at surface, covers < 0.1 % of this area: Quaternary colluvium, fanglomerate, and talus plus some glacial debris in upland valleys.
Lithology: alluvium; glacial drift; colluvium
Permian (1) sedimentary rocks in southeastern Utah (Pennsylvanian to Early Permian) at surface, covers 2 % of this area: Lithology: sandstone; fine-grained mixed clastic; limestone
Terrace gravel (Phanerozoic | Cenozoic | Tertiary Quaternary | Pliocene Pleistocene) at surface, covers < 0.1 % of this area: TERRACE GRAVEL (PLEISTOCENE AND/OR PLIOCENE)--Partly consolidated gravel above and flanking some major streams.
Lithology: gravel
Cretaceous (3) sedimentary rocks in western Utah (Late Cretaceous) at surface, covers < 0.1 % of this area: Lithology: sandstone; siltstone; conglomerate
Devonian sedimentary rocks in southewestern Utah (Devonian) at surface, covers < 0.1 % of this area: Lithology: dolostone (dolomite); limestone; sandstone; shale
Tertiary intrusive rocks in northwestern Utah (Oligocene) at surface, covers < 0.1 % of this area: Lithology: granodiorite; quartz monzonite; diorite
Older Precambrian metamorphic rocks in central Utah (Precambrian) at surface, covers < 0.1 % of this area: Lithology: metamorphic rock
Dolomite, limestone, and minor amounts of sandstone and quartzite (Devonian) at surface, covers < 0.1 % 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
Triassic (1) sedimentary rocks in Salt southeastern Utah (Early Triassic) at surface, covers 1 % of this area: Lithology: mudstone; sandstone; siltstone; limestone; evaporite; conglomerate
Ordovician metasedimentary rocks in northwestern Utah (Ordovician) at surface, covers < 0.1 % of this area: Lithology: metasedimentary rock
Mississippian (3) sedimentary rocks in western Utah (Mississippian) at surface, covers < 0.1 % of this area: Lithology: fine-grained mixed clastic; black shale; limestone
Pennsylvanian and Permian sedimentary rocks in Salt Lake City-Coalville-Randolph region (Pennsylvanian to Permian) at surface, covers < 0.1 % of this area: Lithology: orthoquartzite; limestone
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
Cretaceous and Tertiary sedimentary rocks in Logan-Huntsville Allochthon (Late Cretaceous to Paleocene) at surface, covers < 0.1 % of this area: Lithology: sandstone; mudstone; coal
Older Precambrian metamorphic rocks in Uinta Mountains-Uinta Basin region (Proterozoic W) at surface, covers < 0.1 % of this area: Lithology: quartzite; schist; amphibolite
Glen Canyon Group and Chinle Fm (Phanerozoic | Mesozoic | Triassic Jurassic) at surface, covers < 0.1 % of this area: In southwest, Glen Canyon Group consists of Navajo Sandstone, Kayenta Fm (red siltstone, shale, and sandstone) and Wingate Sandstone; Chinle is red siltstone
Lithology: sandstone; siltstone; shale
Quaternary surficial deposits, undivided (Quaternary) at surface, covers < 0.1 % of this area: Unconsolidated to strongly consolidated alluvial and eolian deposits. This unit includes: coarse, poorly sorted alluvial fan and terrace deposits on middle and upper piedmonts and along large drainages; sand, silt and clay on alluvial plains and playas; and wind-blown sand deposits. (0-2 Ma)
Lithology: sand; gravel; mud; silt
Pennsylvanian sedimentary rocks in southeastern Utah (Mississipian to Pennsylvanian) at surface, covers < 0.1 % of this area: Lithology: evaporite; black shale
Mesaverde Group, Ericson Sandstone (Phanerozoic | Mesozoic | Cretaceous-Late) at surface, covers < 0.1 % of this area: MESAVERDE GROUP (SOUTH WYOMING). Rock Springs uplift. Ericson Sandstone--White massive sandstone; lenticular chert-grit conglomerate in upper part.
Lithology: sandstone; conglomerate
Tertiary (5) sedimentary rocks in southeastern Utah (Pliocene) at surface, covers < 0.1 % of this area: Lithology: conglomerate
Older Precambrian metamorphic rocks in southwestern Utah (Precambrian) at surface, covers < 0.1 % of this area: Lithology: schist; plutonic rock (phaneritic)
Siltstone, sandstone, limestone, and dolomite (commonly silty or sandy) and gypsum (Early Permian) at surface, covers < 0.1 % 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
Coralline Limestone, sandstone, siltstone, shale, chert, and phosphorite; Mississippianshallow marine inner continental-shelf deposits; east-central Idaho, central Idaho (Mississippian ) at surface, covers < 0.1 % of this area: Mississippian shallow-water coralline limestone interval of southern Idaho.
Lithology: limestone; sandstone; siltstone; shale; chert; phosphorite
Granitic rocks (Jurassic) at surface, covers < 0.1 % of this area: GRANITIC ROCKS-Mostly quartz monzonite and granodiorite
Lithology: quartz monzonite; granodiorite; granite; monzonite; quartz diorite; peraluminous granite
Cambrian quartzite in southwestern Utah (Early to Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: arenite
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
Dolostone, shale, and chert; Silurian marine inner continental-shelf deposits (Late and Middle Silurian) at surface, covers < 0.1 % of this area: Upper and Middle Silurian fossiliferous dolomite; clay, silt and sand near base.
Lithology: dolostone (dolomite); shale; chert
Precambrian intrusive rocks in western Utah (Precambrian) at surface, covers < 0.1 % of this area: Lithology: granitoid
Undivided surficial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area: UNDIVIDED SURFICIAL DEPOSITS--Mostly alluvium, colluvium, and glacial and landslide deposits. Primarily in Yellowstone area and Bighorn Mountains.
Lithology: alluvium; colluvium; glacial drift; landslide
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
Cherty limestone and sparse dolomite, shale, and sandstone (Permian) at surface, covers < 0.1 % 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, arenite, shale, dolostone, and siltstone; Upper Proterozoic to Cambrian marine continental-shelf deposits; southeastern Idaho (Cambrian) at surface, covers < 0.1 % of this area: Cambrian marine dolomite, limestone, claystone, and quartzite; grades into Precambrian.
Lithology: limestone; arenite; shale; dolostone (dolomite); siltstone
San Rafael Group (Middle to Late Jurassic) at surface, covers < 0.1 % of this area: Commonly cross-bedded, ledge-forming sandstone and slope-forming siltstone. Rock typically has a striped red and white aspect. The Carmel Formation and Entrada Sandstone are prominent members of this group. (Late to Middle Jurassic, about 160-180 Ma)
Lithology: sandstone; siltstone; bentonite; mudstone; conglomerate; limestone; dolostone (dolomite); orthoquartzite; gypsum
Older Precambrian metamorphic rocks in southeastern Utah (Precambrian) at surface, covers < 0.1 % of this area: Lithology: metamorphic rock; plutonic rock (phaneritic); mudstone
Open Water (Holocene) at surface, covers < 0.1 % of this area: Lakes and streams
Lithology: water
Glacial deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area: GLACIAL DEPOSITS--Till and outwash of sand, gravel, and boulders.
Lithology: glacial drift
Glacial debris; Late Pleistocene till, outwash, and alluvium of valley glaciers; high mountain valleys (Late Pleistocene ) at surface, covers < 0.1 % of this area: Pleistocene upland valley deposits; commonly derived from alpine glaciation.
Lithology: till; outwash; alluvium
Nugget Sandstone (Phanerozoic | Mesozoic | Triassic(?) Jurassic(?) ) at surface, covers < 0.1 % of this area: NUGGET SANDSTONE--Thrust Belt: Buff to pink crossbedded well-sized and well-sorted quartz sandstone and quartzite; locally has oil and copper-silver-zinc mineralization. North Wyoming: Gray to dull-red, crossbedded quartz sandstone.
Lithology: sandstone
Tertiary (4) sedimentary rocks in southeastern Utah (Late Eocene) at surface, covers < 0.1 % of this area: Lithology: mudstone; sandstone; limestone
Triassic (2) sedimentary rocks in Logan-Huntsville Allochthon (Middle to Late Triassic) at surface, covers < 0.1 % of this area: Lithology: shale; siltstone; conglomerate
Tertiary (4) sedimentary rocks in northwestern Utah (Middle Miocene to Late Pliocene) at surface, covers < 0.1 % of this area: Lithology: mudstone; sandstone; conglomerate
Landslide deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area: LANDSLIDE DEPOSITS--Locally includes intermixed landslide and glacial deposits, talus, and rock-glacier deposits.
Lithology: landslide; glacial drift
Red Creek Quartzite (Archean) at surface, covers < 0.1 % of this area: Metaquartzite, amphibolite, and mica schist. Present only in small area at Utah border in Uinta Mountains
Lithology: quartzite; amphibolite; mica schist
Green River Formation: Laney Member (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers < 0.1 % of this area: GREEN RIVER FORMATION Laney Member (age probably about 45 Ma)--Oil shale and marlstone.
Lithology: oil shale; mixed clastic/carbonate
Dakota Sandstone and Burro Canyon Fm (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area: Sandstone, shale, and conglomerate. In northwest and west-central: Lower Cretaceous. In southwest: Lower and Upper Cretaceous.
Lithology: sandstone; shale; conglomerate
Morrison Fm (Phanerozoic | Mesozoic | Jurassic) at surface, covers < 0.1 % of this area: Variegated claystone, mudstone, sandstone, and local beds of limestone
Lithology: mudstone; sandstone; limestone
Mississippian (3) sedimentary rocks in northwestern Utah (Mississippian) at surface, covers < 0.1 % of this area: Lithology: shale
Mississippian (3) sedimentary rocks in Logan-Huntsville Allochthon (Mississippian) at surface, covers < 0.1 % of this area: Lithology: shale; limestone; dolostone (dolomite); black shale; chert
Middle Cambrian shale and carbonate rocks in Uinta Mountains-Uinta Basin area (Middle Cambrian) at surface, covers < 0.1 % of this area: Lithology: limestone
Mancos Shale (Phanerozoic | Mesozoic | Cretaceous) at surface, covers < 0.1 % of this area: In northwest and west-central: Intertongues complexly with units of overlying Mesaverde Group or Fm; lower part consists of a calcareous Niobrara equivalent and Frontier Sandstone and Mowry Shale Members; in areas where the Frontie
Lithology: shale; sandstone
Limestone, sandstone, shale, and chert; Pennsylvanian marine epicontinental-basin deposits; southeastern Idaho (Pennsylvanian) at surface, covers < 0.1 % of this area: Pennsylvanian beds; lowermost portion of the southern Idaho sequence (PPNs).
Lithology: limestone; sandstone; shale; chert

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