Geologic units in Jefferson Davis Parish, Louisiana

Prairie Terraces (Pleistocene) at surface, covers 84 % of this area

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

Alluvium (Holocene) at surface, covers 14 % of this area

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

Chenier Plain, Fresh Marsh (Holocene) at surface, covers 1 % of this area

Gray to brown to black clay and silt of high organic content.

Intermediate Terraces (Pleistocene) at surface, covers 0.7 % of this area

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