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Geologic units in Grimes county, Texas

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 3 % of this area
Terrace deposits
Lithology: terrace; sand; gravel; silt; clay or mud
Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers < 0.1 % of this area
Lissie Formation
Lithology: sand; silt; clay or mud
alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 1 % of this area
alluvium
Lithology: sand; silt; clay or mud; gravel
Willis Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 13 % of this area
Willis Formation
Lithology: clay or mud; silt; sand; gravel
Whitsett Formation (Phanerozoic | Cenozoic | Tertiary | Eocene Oligocene) at surface, covers 4 % of this area
Whitsett Formation
Lithology: clay or mud; sandstone; siltstone; sand
Catahoula Formation (Phanerozoic | Cenozoic | Tertiary | Oligocene) at surface, covers 11 % of this area
Catahoula Formation
Lithology: mudstone; sand; tuff; sandstone; conglomerate
Oakville Sandstone (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers < 0.1 % of this area
Oakville Sandstone
Lithology: sandstone; clay or mud
Wellborn Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 7 % of this area
Wellborn Formation
Lithology: sandstone; sand ; clay or mud; coal
Manning Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 9 % of this area
Manning Formation
Lithology: clay or mud; sand; bentonite; sandstone; siltstone; coal
Cadell Formation (Phanerozoic | Cenozoic | Tertiary | Eocene) at surface, covers 5 % of this area
Cadell Formation
Lithology: siltstone; clay or mud; sandstone; sand

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