Geologic units in Davis county, Utah

Lake Bonneville deposits (Quaternary) at surface, covers 31 % of this area

Lake Bonneville deposits

Farmington Canyon Complex and Little Willow Schist and Gneiss (Archean) at surface, covers 27 % of this area

Farmington Canyon Complex and Little Willow Schist and Gneiss (2.6 billion years old).

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

Alluvium and colluvium

Mud and salt flats (Holocene) at surface, covers 10 % of this area

Mud and salt flats

Marshes (Holocene) at surface, covers 8 % of this area

Marshes

Tintic Quartzite (Early to Middle Cambrian) at surface, covers 3 % of this area

Tintic Quartzite

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

Wasatch Formation.

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

Landslides

Glacial deposits (Quaternary) at surface, covers 0.5 % of this area

Glacial deposits

Hambug Formation and Deseret Limestone (Mississippian) at surface, covers 0.4 % of this area

Hambug Formation and Deseret Limestone.

Bloomington Formation, Maxfield Limestone, and Ophir Formations (Middle Cambrian) at surface, covers 0.4 % of this area

Bloomington Formation, Maxfield Limestone, and Ophir Formations.

Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation (Devonian) at surface, covers 0.2 % of this area

Beirdneau Sandstone, Hyrum Dolomite, and Water Canyon Formation.

Mutual Formation, Mineral Fork Tillite, and Big Cottonwood Formation (Proterozoic Y to Proterozoic Z) at surface, covers < 0.1 % of this area

Mutual Formation, Mineral Fork Tillite, and Big Cottonwood Formation (16,000 feet thick).

Frontier Formation (Late Cretaceous) at surface, covers < 0.1 % 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.

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.

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

Morrison Formation.