Geologic units in Livingston Parish, Louisiana

Prairie Terraces (Pleistocene) at surface, covers 57 % of this area

Light gray to light brown clay, sandy clay, silt, sand, and some gravels.

Alluvium (Holocene) at surface, covers 34 % of this area

Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.

Prairie Terraces (Pleistocene) at surface, covers 6 % of this area

Light gray to light brown clay, sandy clay, silt, sand, and some gravels. Overlain by 1-9 meters of loess.

Intermediate Terraces (Pleistocene) at surface, covers 3 % of this area

Light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.