Skip to main content

Geologic units in Colorado county, Texas

Willis Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 32 % of this area

Willis Formation

Lithology: clay or mud; silt; sand; gravel

Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers 24 % of this area

Lissie Formation

Lithology: sand; silt; clay or mud

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 23 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Beaumont Formation, areas predominantly sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 10 % of this area

Beaumont Formation, areas predominantly sand

Lithology: sand; silt; clay or mud; gravel

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 6 % of this area

Terrace deposits

Fleming Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 3 % of this area

Fleming Formation

Lithology: clay or mud; sandstone

Beaumont Formation, areas predominantly clay (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 1 % of this area

Beaumont Formation, areas predominantly clay

Lithology: clay or mud; silt

Goliad Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 0.4 % of this area

Goliad Formation