Geologic units in Rich county, Utah

Additional scientific data in this geographic area

Wasatch and Evanston? Formations undivided (Late Cretaceous to Early Eocene) at surface, covers 50 % of this area

Wasatch and Evanston? Formations undivided.

Wasatch Formation (Late Paleocene to Early Eocene) at surface, covers 15 % of this area

Wasatch Formation.

Alluvium and colluvium (Quaternary) at surface, covers 14 % of this area

Alluvium and colluvium

Older alluvial deposits (Quaternary) at surface, covers 8 % of this area

Older alluvial deposits

Geertsen Canyon Quartzite (Early to Middle Cambrian) at surface, covers 2 % of this area

Geertsen Canyon Quartzite (upper part of the Bingham Group).

Stump and Preuss Sandstones and Twin Creek Limestone (Middle to Late Jurassic) at surface, covers 2 % of this area

Stump and Preuss Sandstones and Twin Creek Limestone.

Nugget Sandstone (Early Jurassic) at surface, covers 1 % of this area

Nugget Sandstone.

Bloomington, Blacksmith, Ute, and Langston Formations (Middle Cambrian) at surface, covers 1 % of this area

Bloomington, Blacksmith, Ute, and Langston Formations.

Fish Haven Dolomite, Swan Peak Quartzite, and Garden City Limestone (Ordovician) at surface, covers 1 % of this area

Fish Haven Dolomite, Swan Peak Quartzite, and Garden City Limestone.

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

Hambug Formation and Deseret Limestone.

St. Charles Formation, Worm Creek Quartzite, and Nounan Dolomite (Middle Cambrian to Early Ordovician) at surface, covers 0.7 % of this area

St. Charles Formation, Worm Creek Quartzite, and Nounan Dolomite.

Laketown Dolomite (Silurian) at surface, covers 0.7 % of this area

Laketown Dolomite.

Weber Quartzite (Pennsylvanian to Permian) at surface, covers 0.7 % of this area

Weber Quartzite

Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation (Devonian) at surface, covers 0.6 % of this area

Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation.

Gardison and Lodgepole Limestones (Mississippian) at surface, covers 0.5 % of this area

Gardison and Lodgepole Limestones.

Fowkes Formation (Eocene) at surface, covers 0.4 % of this area

Fowkes Formation.

Park City and Phosphoria Formations (Permian) at surface, covers 0.4 % of this area

Park City and Phosphoria Formations.

Thaynes Formation (Early Triassic) at surface, covers 0.4 % of this area

Thaynes Formation.

Fish Haven Dolomite and Garden City Limestone (Ordovician) at surface, covers 0.2 % of this area

Fish Haven Dolomite and Garden City Limestone.

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

Ankareh Shale.

Park City and Phosphoria Formations (Permian) at surface, covers 0.1 % of this area

Park City and Phosphoria Formations.

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

Leatham Formation, Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation.

St. Charles Formation and Nounan Dolomite (Middle Cambrian to Early Ordovician) at surface, covers < 0.1 % of this area

St. Charles Formation and Nounan Dolomite.

Wells Formation (Pennsylvanian to Permian) at surface, covers < 0.1 % of this area

Wells Formation.

Sedimentary rocks (Devonian to Ordovician). (Devonian to Ordovician) at surface, covers < 0.1 % of this area

Marine dolostone and limestone and sandstone in east-central and southeastern Idaho (Summerhouse, Kinnikinic, and Swan Peak sandstones, Fish Haven, Laketown, Jefferson, Three Forks, and Darby formations) and deep-water carbonaceous mudrocks of Phi Kappa, Trail Creek, and Milligen formations east of Ketchum. (Paleocene to Neoproterozoic Sedimentary and Igneous Rocks of the Cordilleran System).

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

Evanston Formation (lower part).

Salt Lake Formation? (Middle Miocene to Late Pliocene) at surface, covers < 0.1 % of this area

Tuffaceous sediments, mudstone, sandstone, valley fill.

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.

Sedimentary rocks (Ordovician and Cambrian). (Ordovician and Cambrian) at surface, covers < 0.1 % of this area

Marine limestone, dolomite, and subordinate shale and sandstone of Cambrian carbonate bank of southeast Idaho stratigraphically up to St. Charles Formation and Ordovician Garden City Limestone. Includes Bayhorse succession (Cash Creek Quartzite, Garden Creek Phyllite, Bayhorse Dolomite, Ramshorn Slate, and Clayton Mine Quartzite) of Clayton area and Pioneer Mountains; quartzite of Kamiak Butte north of Moscow; and Cambrian Gold Creek quartzite, Rennie Shale, and Lakeview Limestone east of Bayview. (Paleocene to Neoproterozoic Sedimentary and Igneous Rocks of the Cordilleran System).

Sedimentary rocks associated with Basin and Range extension. (Quaternary, Pliocene, and Miocene) at surface, covers < 0.1 % of this area

Fluvial, fan, and lacustrine deposits and intercalated volcanic rocks of the Basin and Range Province (~16-2 Ma); consolidated to weakly consolidated sandstone, siltstone, arkose, conglomerate, mudstone, tuffaceous sediment, basalt, basaltic tephra, and rhyolite tuff. Includes deposits of Lake Idaho (Idaho Group) in western Snake River Plain and Salt Lake Formation deposited in Basin and Range Province of east-central Idaho. (Quaternary to Eocene Continental Sediments and Sedimentary Rocks).

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.

Salt Lake Formation (Miocene-Pliocene) at surface, covers < 0.1 % of this area

White, gray, and green limy tuff, siltstone, sandstone, and conglomerate.

Nugget Sandstone (Jurassic(?) and Triassic(?)) at surface, covers < 0.1 % of this area

(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.

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

Gray siltstone, sparse red sandstone, and lignite beds.