Geologic units in Travis county, Texas

Glen Rose Limestone (Early Cretaceous) at surface, covers 32 % of this area

Glen Rose Limestone

Navarro and Taylor Groups, undivided (Late Cretaceous; Gulfian Series) at surface, covers 11 % of this area

Navarro and Taylor Groups, undivided

Austin Chalk (Late Cretaceous; Gulfian Series) at surface, covers 9 % of this area

Austin Chalk

Navarro Group and Marlbrook Marl, undivided (Late Cretaceous; Gulfian Series) at surface, covers 7 % of this area

Navarro Group and Marlbrook Marl, undivided

Terrace deposits (Pleistocene and Holocene) at surface, covers 7 % of this area

Terrace deposits

High gravel deposits (Pleistocene) at surface, covers 5 % of this area

High gravel deposits

Fredericksburg Group (Early Cretaceous; Comanchean Series) at surface, covers 5 % of this area

Fredericksburg Group

Walnut Clay (Early Cretaceous) at surface, covers 3 % of this area

Walnut Clay

Edwards Limestone (Early Cretaceous) at surface, covers 3 % of this area

Edwards Limestone

Ozan Formation (Late Cretaceous; Gulfian Series) at surface, covers 3 % of this area

Ozan Formation

Alluvium (Holocene) at surface, covers 3 % of this area

Alluvium

Pecan Gap Chalk (Late Cretaceous; Gulfian Series) at surface, covers 2 % of this area

Pecan Gap Chalk

Hensell Sand (Early Cretaceous; Comanchean Series) at surface, covers 2 % of this area

Hensell Sand

Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided (Early Cretaceous) at surface, covers 2 % of this area

Cow Creek Limestone, Hammett Shale, and Sycamore Sand, undivided

Midway Group, undivided (Paleocene) at surface, covers 2 % of this area

Midway Group, undivided

Neylandville and Marlbrook Marls, undivided (Late Cretaceous; Gulfian Series) at surface, covers 1 % of this area

Neylandville and Marlbrook Marls, undivided

Del Rio Clay and Georgetown Limestone, undivided (Late Cretaceous; Gulfian Series) at surface, covers 1 % of this area

Del Rio Clay and Georgetown Limestone, undivided

Eagle Ford Formation and Buda Limestone, undivided (Late Cretaceous) at surface, covers 0.9 % of this area

Eagle Ford Formation and Buda Limestone, undivided

Onion Creek Marl (Pleistocene) at surface, covers 0.3 % of this area

Onion Creek Marl

Igneous rocks of Austin age (Late Cretaceous) at surface, covers 0.3 % of this area

Igneous rocks of Austin age

Paluxy Sand and Glen Rose Limestone, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Paluxy Sand and Glen Rose Limestone, undivided

Edwards and Comanche Peak Limestones, undivided (Early Cretaceous) at surface, covers < 0.1 % of this area

Edwards and Comanche Peak Limestones, undivided