Geologic units in East Feliciana Parish, Louisiana

High Terraces (Pleistocene) at surface, covers 67 % of this area

Tan to orange clay, silt, and sand with a large amount of basal gravels. Overlain by 1-9 meters of loess.

Alluvium (Holocene) at surface, covers 28 % of this area

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

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. Overlain by 1-9 meters of loess.

Prairie Terraces (Pleistocene) at surface, covers 0.6 % of this area

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

Natural Levees (Holocene) at surface, covers 0.5 % of this area

Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.

Citronelle formation (Pleistocene) at surface, covers < 0.1 % of this area

Red sand and gravel and white clay; may be of Pliocene age; the formation mapped is equivalent to the Willis sand and does not include the terrace deposits, colluvium, and residuum commonly considered "Citronelle".

Pascagoula and Hattiesburg formation (Miocene) at surface, covers < 0.1 % of this area

Green and bluish-green clay, sandy clay, and sand; gray siltstone and sand; locally fossiliferous.