Geologic units in Sevier county, Utah

Miocene volcanic rocks, undivided (Late Oligocene to Middle Miocene) at surface, covers 27 % of this area

In Western Utah: Quichapa Group and other volcanic rocks (Tmb,Tmr,Tma). In Central Utah: Silver Shield Latite (17 my) and Pinyon Creek Conglomerate.

Alluvium and colluvium (Quaternary) at surface, covers 23 % of this area

Alluvium and colluvium

Mesaverde Group (Late Cretaceous) at surface, covers 10 % of this area

Mesaverde Group (Price River Fm, Castlegate Ss, Blackhawk Fm (coal), and Star Point Ss).

North Horn and Canaan Peak Formations (Late Cretaceous to Paleocene) at surface, covers 6 % of this area

North Horn and Canaan Peak Formations.

Flagstaff Limestone (Late Paleocene to Early Eocene) at surface, covers 5 % of this area

Flagstaff Limestone.

Mancos Shale (Late Cretaceous) at surface, covers 5 % of this area

Mancos Shale (Masuk Shale Mbr, Emery Sandstone Mbr, Blue Gate Shale Mbr, Ferron Sandstone Mbr, and Tununk Shale Mbr).

Isom Fm, Needles Range Fm, and Bullion Canyon Volcanics (Late Eocene to Oligocene) at surface, covers 5 % of this area

In Cedar City area: Isom Fm and Needles Range Fm (29 my). In Marysvale area: Bullion Canyon Volcanics.

Older alluvial deposits (Quaternary) at surface, covers 3 % of this area

Older alluvial deposits

Green River Formation (Eocene) at surface, covers 3 % of this area

Green River Formation.

Flagstaff Formation (Late Paleocene to Early Eocene) at surface, covers 3 % of this area

Flagstaff Formation.

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

Landslides

Arapien Shale (Middle Jurassic) at surface, covers 2 % of this area

Arapien Shale (Summerville Formation, Entrada Sandstone and Carmel Formation).

Sevier River Formation (Miocene to Pliocene) at surface, covers 2 % of this area

Sevier River Formation.

Bluff Ss, Summerville Fm, Curtis Fm, Entrada Ss, and Carmel Formation (Middle to Late Jurassic) at surface, covers 1 % of this area

Bluff Ss, Summerville Fm, Curtis Fm, Entrada Ss, and Carmel Formation. Includes Arches National Park.

Duchesne River, Uinta and Bridger Formations (Late Eocene to Early Oligocene) at surface, covers 1 % of this area

Duchesne River, Uinta and Bridger Formations

North Horn Formation (Late Cretaceous to Eocene) at surface, covers 1.0 % of this area

North Horn Formation.

Salt Lake Formation (?) and other Basin & Range valley-filling alluvial, lacustrine, and volcanic materials (Middle Miocene to Late Pliocene) at surface, covers 0.8 % of this area

Salt Lake Formation (?) and other Basin & Range valley-filling alluvial, lacustrine, and volcanic materials. Valley fill is more than 13,000 feet thick in the central part of Utah Valley.

Bald Knoll and Gray Gulch Formations (Late Eocene) at surface, covers 0.8 % of this area

Bald Knoll and Gray Gulch Formations.

Glacial deposits (Quaternary) at surface, covers 0.8 % of this area

Glacial deposits

Alluvial materials, Axtell and Harkers Formations (Pliocene to Quaternary) at surface, covers 0.3 % of this area

Alluvial materials, Axtell and Harkers Formations

Dakota Ss and Cedar Mtn. or Burro Canyon Formations (Cretaceous) at surface, covers 0.3 % of this area

Dakota Ss and Cedar Mtn or Burro Canyon Formations.

Quartz Monzonite and granite (Oligocene to Miocene) at surface, covers 0.1 % of this area

Quartz Monzonite (in Cedar City area) and monzonite and granite (in Marysvale area).

Morrison Formation (Brushy Basin and Salt Wash Members) (Late Jurassic) at surface, covers < 0.1 % of this area

Morrison Formation (Brushy Basin and Salt Wash Members).

Basalts (Pliocene) at surface, covers < 0.1 % of this area

Basalts

Eolian deposits (Quaternary) at surface, covers < 0.1 % of this area

Eolian deposits

Rhyolites (Middle to Late Miocene) at surface, covers < 0.1 % of this area

In Northwestern Utah: Dacitic tuff (8.5 my). In Logan-Huntsville Allochthon: rhyolite.

Basalts (Early to Middle Miocene) at surface, covers < 0.1 % of this area

In Southwestern Utah: In Cedar City area: Page Ranch Fm, Rencher Fm and Quichapa Group (24my). In Marysvale area: Joe Lott Tuff, Mt. Belknap Volcanics, Osiris Tuff and Mt. Dutton Formation.

Silver City Monzonite, Sunrise Peak Monzonite Porphyry, Swanson Quartz Monzonite (Late Eocene to Oligocene) at surface, covers < 0.1 % of this area

Silver City Monzonite (31 my), Sunrise Peak Monzonite Porphyry, Swanson Quartz Monzonite