Geologic units in Summit county, Utah

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

Glacial deposits

Uinta Mountain Group (including Red Pine Shale) (Proterozoic Y) at surface, covers 15 % of this area

Uinta Mountain Group (24,000 feet thick along the Green River). Red Pine Shale (950 my).

Wasatch Formation (Late Paleocene to Early Eocene) at surface, covers 12 % of this area

Wasatch Formation.

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

Alluvium and colluvium

Wasatch/Colton Formations and Flagstaff Limestone (Early to Middle Eocene) at surface, covers 6 % of this area

Wasatch/Colton Formations and Flagstaff Limestone.

Bishop Conglomerate (Oligocene) at surface, covers 6 % of this area

Bishop Conglomerate.

Evanston Formation (Late Cretaceous to Paleocene) at surface, covers 6 % of this area

Evanston Formation (lower part).

Frontier Formation (Late Cretaceous) at surface, covers 5 % of this area

Frontier Formation - includes the following members: Upton Ss, Judd Sh, Grass Creek, Dry Hollow, Oyster Ridge Ss, Allen Hollow, Shale Member, Coalville Member, Chalk Creek, Springs Canyon, and Longwall Ss.

Keetley Volcanics (Late Eocene to Oligocene) at surface, covers 4 % of this area

Keetley Volcanics

Aspen Shale and Kelvin Formation (Early Cretaceous) at surface, covers 3 % of this area

Aspen Shale and Kelvin Formation.

Echo Canyon Conglomerate and Henefer Formation (Late Cretaceous) at surface, covers 2 % of this area

Echo Canyon Conglomerate and Henefer Formation.

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

Older alluvial deposits

Weber Sandstone (Pennsylvanian to Permian) at surface, covers 1 % of this area

Weber Sandstone.

Madison Limestone (Mississippian) at surface, covers 1 % of this area

Madison Limestone.

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

Landslides

Morgan Formation and Round Valley Limestone (Pennsylvanian) at surface, covers 1 % of this area

Morgan Formation and Round Valley Limestone.

Fowkes Formation (Eocene) at surface, covers 1.0 % of this area

Fowkes Formation.

Humbug Formation and Deseret Limestone (Mississippian) at surface, covers 0.8 % of this area

Humbug Formation and Deseret Limestone.

Stump and Preuss Sandstones and Twin Creek Limestone (Middle to Late Jurassic) at surface, covers 0.6 % of this area

Stump and Preuss Sandstones and Twin Creek Limestone.

Nugget Sandstone (Early Jurassic) at surface, covers 0.6 % of this area

Nugget Sandstone.

Park City Formation (Permian) at surface, covers 0.5 % of this area

Park City Formation.

Thanes Formation, Woodside Shale, and Dinwoody Formation (Early Triassic) at surface, covers 0.5 % of this area

Thanes Formation, Woodside Shale, and Dinwoody Formation.

Moenkopi and Dinwoody Formations (Early Triassic) at surface, covers 0.4 % of this area

Moenkopi and Dinwoody Formations.

Salt Lake Formation and valley-filling alluvial, lacustrine and volcanic materials (Middle Miocene to Late Pliocene) at surface, covers 0.3 % of this area

Salt Lake Formation and valley-filling alluvial, lacustrine and volcanic materials.

Doughnut Shale (Mississippian) at surface, covers 0.2 % of this area

Doughnut Shale.

Diamond Creek Sandstone and Kirkman Limestone (Early Permian) at surface, covers 0.2 % of this area

Diamond Creek Sandstone and Kirkman Limestone.

Park City and Phosphoria Formations (Permian) at surface, covers 0.2 % of this area

Park City and Phosphoria Formations.

Ankareh Shale (Middle to Late Triassic) at surface, covers 0.2 % of this area

Ankareh Shale.

Morrison Formation (Late Jurassic) at surface, covers 0.1 % of this area

Morrison Formation.

Chinle Shale and Garta Sandstone Member (Late Triassic) at surface, covers 0.1 % of this area

Chinle Shale and Garta Sandstone Member.

Duchesne River, Uinta and Bridger Formations (Middle Eocene to Early Oligocene) at surface, covers 0.1 % of this area

Duchesne River Fm, Uinta Formation (south of Uinta Mtns.) and Bridger Formation (north of Uinta Mtns.).

Ankareh Shale (Middle to Late Triassic) at surface, covers 0.1 % of this area

Ankareh Shale.

Lodore Sandstone (Early to Middle Cambrian) at surface, covers < 0.1 % of this area

Lodore Sandstone.

Landslide deposits (Pleistocene-Holocene) at surface, covers < 0.1 % of this area

Locally includes intermixed landslide and glacial deposits, talus, and rock-glacier deposits.

Undivided surficial deposits (Pleistocene-Holocene) at surface, covers < 0.1 % of this area

Mostly alluvium, colluvium, and glacial and landslide deposits. Primarily in Yellowstone area and Bighorn Mountains.

Clayton Peak and Pine Creek stocks (Late Eocene to Oligocene) at surface, covers < 0.1 % of this area

Clayton Peak and Pine Creek stocks.

Wasatch Formation (Eocene) at surface, covers < 0.1 % of this area

(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.

Nugget (Navajo) Sandstone (Early Jurassic) at surface, covers < 0.1 % of this area

Nugget (Navajo) Sandstone.

Alluvium and Colluvium (Pleistocene-Holocene) at surface, covers < 0.1 % of this area

Clay, silt, sand, and gravel in flood plains, fans, terraces, and slopes.

Glacial deposits (Pleistocene-Holocene) at surface, covers < 0.1 % of this area

Till and outwash of sand, gravel, and boulders.

Bishop Conglomerate (Oligocene) at surface, covers < 0.1 % of this area

Clasts of red quartzite, gray chert, and limestone in a gray to white tuffaceous sandstone matrix.

Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation (Devonian) at surface, covers < 0.1 % of this area

Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation.

Bridger Formation (Eocene) at surface, covers < 0.1 % of this area

Greenish-gray, olive-drab, and white tuffaceous sandstone and claystone; lenticular marlstone and conglomerate.

Fowkes Formation (Eocene) at surface, covers < 0.1 % of this area

Light-colored tuffaceous sandstone and siltstone, locally conglomeratic. Locally designated by some as Norwood Tuff.

Sage Junction, Quealy, Cokeville, Thomas Fork, and Smiths Formations (Lower Cretaceous) at surface, covers < 0.1 % of this area

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 Form Formation - Variegated mudstone and gray sandstone. Smiths Formation - Ferruginous black shale and tan to brown sandstone.

Evanston Formation (Upper Cretaceous-Paleocene) at surface, covers < 0.1 % of this area

Gray siltstone, sparse red sandstone, and lignite beds.

Terrace gravel (Pliocene-Pleistocene) at surface, covers < 0.1 % of this area

Partly consolidated gravel above and flanking some major streams.