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Geologic units in Montgomery county, Texas

Willis Formation (Phanerozoic | Cenozoic | Tertiary | Pliocene) at surface, covers 50 % of this area

Willis Formation

Lithology: clay or mud; silt; sand; gravel

Lissie Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Middle) at surface, covers 30 % of this area

Lissie Formation

Lithology: sand; silt; clay or mud

Beaumont Formation, areas predominantly sand (Phanerozoic | Cenozoic | Quaternary | Pleistocene-Late) at surface, covers 7 % of this area

Beaumont Formation, areas predominantly sand

Lithology: sand; silt; clay or mud; gravel

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

alluvium

Lithology: sand; silt; clay or mud; gravel

Deweyville Formation (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene (?)) at surface, covers 3 % of this area

Deweyville Formation

Lithology: sand; silt; clay or mud

Fleming Formation (Phanerozoic | Cenozoic | Tertiary | Miocene) at surface, covers 2 % of this area

Fleming Formation

Lithology: clay or mud; sandstone

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers 1 % of this area

Terrace deposits