Geologic units in McCulloch county, Texas

Quaternary deposit, undivided (Quaternary) at surface, covers 18 % of this area

Quaternary deposit, undivided

Edwards Limestone (Early Cretaceous) at surface, covers 13 % of this area

Edwards Limestone

Antlers Sand (Early Cretaceous) at surface, covers 9 % of this area

Antlers Sand

Gorman Formation (Early Ordovician) at surface, covers 7 % of this area

Gorman Formation

Tanyard Formation (Early Ordovician) at surface, covers 5 % of this area

Tanyard Formation

Thrifty and Graham Formations, undivided (Late Pennsylvanian; Virgil Series) at surface, covers 5 % of this area

Thrifty and Graham Formations, undivided

Strawn Group (Middle Pennsylvanian; Atoka and Des Moines Series) at surface, covers 4 % of this area

Strawn Group

Home Creek Limestone and Colony Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 4 % of this area

Home Creek Limestone and Colony Creek Shale, undivided

Ranger Limestone and Placid Creek Shale, undivided (Pennsylvanian; Missouri Series) at surface, covers 4 % of this area

Ranger Limestone and Placid Creek Shale, undivided

Winchell Limestone (Pennsylvanian; Missouri Series) at surface, covers 3 % of this area

Winchell Limestone

Hensell Sand (Early Cretaceous; Comanchean Series) at surface, covers 3 % of this area

Hensell Sand

Wilberns Formation showing San Saba Member (Late Cambrian) at surface, covers 3 % of this area

Wilberns Formation showing San Saba Member

Santa Anna Branch Shale and Sedwick and Moran Formations, undivided (Permian; Wolfcamp Series) at surface, covers 3 % of this area

Santa Anna Branch Shale and Sedwick and Moran Formations, undivided

Cedarton Shale and Adams Branch Limestone, undivided (Pennsylvanian; Missouri Series) at surface, covers 2 % of this area

Cedarton Shale and Adams Branch Limestone, undivided

Marble Falls Limestone (Pennsylvanian; Morrow Series) at surface, covers 2 % of this area

Marble Falls Limestone

Hickory Sandstone Member (Middle Cambrian) at surface, covers 2 % of this area

Hickory Sandstone Member

Terrace deposits (Pleistocene and Holocene) at surface, covers 2 % of this area

Terrace deposits

Pueblo Formation (Permian; Wolfcamp Series) at surface, covers 1 % of this area

Pueblo Formation

Alluvium (Holocene) at surface, covers 1 % of this area

Alluvium

Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided (Late Cambrian) at surface, covers 1 % of this area

Wilberns Formation showing Point Peak, Morgan Creek Limestone, and Welge Sandstone Members, undivided

Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided (Middle Cambrian) at surface, covers 1 % of this area

Riley Formation showing Lion Mountain Sandstone and Cap Mountain Limestone Members, undivided

Harpersville Formation (Pennsylvanian; Virgil Series) at surface, covers 0.9 % of this area

Harpersville Formation

Packsaddle Schist (preCambrian (Proterozoic); Llano Series) at surface, covers 0.9 % of this area

Packsaddle Schist

Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided (Late; Middle; and Early Mississippian and Devonian) at surface, covers 0.7 % of this area

Barnett Formation, Chappel Limestone, Houy, Zesch, Bear Spring, and Stribling Formations, and Pillar Bluff Limestone, undivided

Valley Spring Gneiss (preCambrian (Proterozoic)) at surface, covers 0.4 % of this area

Valley Spring Gneiss

Travis Peak Formation (Early Cretaceous) at surface, covers 0.4 % of this area

Travis Peak Formation

Coleman Junction Formation (Permian; Wolfcamp Series) at surface, covers 0.4 % of this area

Coleman Junction Formation

Canyon Group, undivided (Late Pennsylvanian; Missouri Series) at surface, covers 0.3 % of this area

Canyon Group, undivided

Town Mountain Granite (preCambrian (Proterozoic)) at surface, covers 0.2 % of this area

Town Mountain Granite

Smithwick Formation (Middle Pennsylvanian; Atoka Series) at surface, covers 0.2 % of this area

Smithwick Formation

Admiral Formation (Permian; Wolfcamp Series) at surface, covers 0.1 % of this area

Admiral Formation

Lost Creek Gneiss (preCambrian (Proterozoic)) at surface, covers 0.1 % of this area

Lost Creek Gneiss

High gravel deposits (Pleistocene) at surface, covers < 0.1 % of this area

High gravel deposits

Elm Creek Formation (Permian; Leonard Series) at surface, covers < 0.1 % of this area

Elm Creek Formation