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Geologic units in Waller county, Texas

Willis Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 43 % of this area

Willis Formation

Lithology: clay or mud; silt; sand; gravel

Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers 36 % of this area

Lissie Formation

Lithology: sand; silt; clay or mud

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 19 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 3 % of this area

Terrace deposits

Beaumont Formation, areas predominantly clay (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers < 0.1 % of this area

Beaumont Formation, areas predominantly clay

Lithology: clay or mud; silt

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

Fleming Formation

Lithology: clay or mud; sandstone