USGS Home
Contact USGS
Search USGS

Mineral Resources > Online Spatial Data > Geology > by state > Utah Geology

Geologic units in Summit county, Utah

Tertiary (4) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Middle Miocene to Late Pliocene) at surface, covers 0.3 % of this area

Lithology: medium-grained mixed clastic; alluvium; lake or marine deposit (non-glacial); pyroclastic; basalt; limestone

Jurassic (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Jurassic) at surface, covers 0.1 % of this area

Lithology: mudstone

Pennsylvanian sedimentary rocks in Uinta Mountains-Uinta Basin region (Pennsylvanian) at surface, covers 1 % of this area

Lithology: dolostone (dolomite); sandstone

Tertiary (1) sedimentary rocks in Uinta Mountains-Unita Basin region (Early to Middle Eocene) at surface, covers 6 % of this area

Lithology: fine-grained mixed clastic; limestone; coal

Oligocene volcanic rocks (Late Eocene to Oligocene) at surface, covers 4 % of this area

Lithology: dacite; rhyolite; andesite; basalt

Jurassic (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Middle to Late Jurassic) at surface, covers 0.6 % of this area

Lithology: limestone; sandstone; fine-grained mixed clastic; evaporite

Permian (1) sedimentary rocks in central Utah (Early Permian) at surface, covers 0.2 % of this area

Lithology: sandstone; limestone

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 Quaternary alluvial deposits (Quaternary) at surface, covers 2 % of this area

Lithology: alluvium

Triassic (1) sedimentary rocks in Salt Uinta Mountains-Uinta Basin region (Early Triassic) at surface, covers 0.4 % of this area

Lithology: mudstone; siltstone; sandstone; evaporite; limestone

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

Cretaceous (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Early Cretaceous) at surface, covers 3 % of this area

Lithology: sandstone; shale; siltstone

Tertiary (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Eocene) at surface, covers 1.0 % of this area

Lithology: fine-grained mixed clastic; conglomerate; tuff; limestone

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

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

Quaternary glacial deposits (Quaternary) at surface, covers 22 % of this area

Lithology: glacial drift

Triassic and Jurassic sedimentary rocks in Uinta Mountains-Uinta Basin region (Early Jurassic) at surface, covers < 0.1 % of this area

Lithology: sandstone

Tertiary (3) sedimentary rocks in Uinta Mountains-Uinta Basin region (Middle Eocene to Early Oligocene) at surface, covers 0.1 % of this area

Lithology: sandstone; mudstone; siltstone; pyroclastic

Triassic (1) sedimentary rocks in Salt central Utah (Early Triassic) at surface, covers < 0.1 % of this area

Lithology: siltstone; mudstone; limestone; sandstone

Mississippian (3) sedimentary rocks in Uinta Mountains-Uinta Basin region (Mississippian) at surface, covers 0.2 % of this area

Lithology: shale; limestone; coal

Permian (2) sedimentary rocks in central Utah (Permian) at surface, covers 0.2 % of this area

Lithology: limestone; mudstone; sandstone; phosphorite; dolostone (dolomite)

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

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

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

Triassic (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Early Triassic) at surface, covers 0.5 % of this area

Lithology: mudstone; limestone; siltstone; sandstone; evaporite

Mississippian (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Mississippian) at surface, covers 0.8 % of this area

Lithology: sandstone; limestone; shale; dolostone (dolomite)

Triassic (2) sedimentary rocks in central Utah (Middle to Late Triassic) at surface, covers 0.2 % of this area

Lithology: mudstone; siltstone; sandstone; conglomerate; evaporite

Quaternary alluvium and colluvium (Quaternary) at surface, covers 8 % of this area

Lithology: alluvium; colluvium

Triassic and Jurassic sedimentary rocks in Salt Lake City-Coalville-Randolph region (Early Jurassic) at surface, covers 0.6 % 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

Tertiary (4) sedimentary rocks in Uinta Mountains-Uinta Basin region (Oligocene) at surface, covers 6 % of this area

Lithology: conglomerate

Tertiary (1) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Paleocene to Early Eocene) at surface, covers 12 % of this area

Lithology: mudstone; conglomerate; limestone

Cretaceous (2) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous) at surface, covers 5 % of this area

Lithology: sandstone; shale; conglomerate

Cambrian quartzite in Uinta Mountains-Uinta Basin area (Early to Middle Cambrian) at surface, covers < 0.1 % of this area

Lithology: sandstone; shale; conglomerate

Cretaceous and Tertiary sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous to Paleocene) at surface, covers 6 % of this area

Lithology: sandstone; mudstone; coal

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

Permian (2) sedimentary rocks in Uinta Mountains-Uinta Basin region (Permian) at surface, covers 0.5 % of this area

Lithology: sandstone; carbonate; fine-grained mixed clastic; phosphorite

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

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

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

Pennsylvanian and Permian sedimentary rocks in Uinta Mountains-Uinta Basin region (Pennsylvanian to Permian) at surface, covers 1 % of this area

Lithology: arenite

Mississippian (1) carbonate rocks in Uinta Mountains-Uinta Basin region (Mississippian) at surface, covers 1 % of this area

Lithology: limestone

Cretaceous (3) sedimentary rocks in Salt Lake City-Coalville-Randolph region (Late Cretaceous) at surface, covers 2 % of this area

Lithology: conglomerate; sandstone; siltstone; mudstone

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

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

Younger Precambrian metamorphic rocks in Uinta Mountains-Uinta Basin region (Proterozoic Y) at surface, covers 15 % of this area

Lithology: arenite; shale; siltstone; mudstone; limestone; conglomerate

Devonian sedimentary rocks in Salt Lake City-Coalville-Randolph region (Devonian) at surface, covers < 0.1 % of this area

Lithology: dolostone (dolomite); sandstone

Quaternary landslides (Quaternary) at surface, covers 1 % of this area

Lithology: landslide