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Geologic units in Grimes county, Texas

Willis Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 24 % of this area

Willis Formation

Lithology: clay or mud; silt; sand; gravel

Catahoula Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 20 % of this area

Catahoula Formation

Manning Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 17 % of this area

Manning Formation

Wellborn Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 13 % of this area

Wellborn Formation

Cadell Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 9 % of this area

Cadell Formation

Whitsett Formation (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 7 % of this area

Whitsett Formation

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

Terrace deposits

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 2 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers < 0.1 % of this area

Lissie Formation

Lithology: sand; silt; clay or mud

Oakville Sandstone (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers < 0.1 % of this area

Oakville Sandstone

Lithology: sandstone; clay or mud