Geologic units in Livingston Parish, Louisiana

Intermediate Terraces (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 3 % of this area: light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.
Lithology: clay or mud; silt; sand; gravel
Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 32 % of this area: gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Lithology: clay or mud; sand; gravel
Prairie Terraces (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 53 % of this area: light gray to light brown clay, sandy clay, silt, sand, and some gravels.
Lithology: clay or mud; silt; sand; gravel
Prairie Terraces (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 5 % of this area: light gray to light brown clay, sandy clay, silt, sand, and some gravels. Overlain by 1-9 meters of loess.
Lithology: clay or mud; silt; sand; gravel