Geologic units in East Baton Rouge Parish, Louisiana

Prairie Terraces (Pleistocene) at surface, covers 50 % of this area

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

Alluvium (Holocene) at surface, covers 24 % 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 11 % 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.

Natural Levees (Holocene) at surface, covers 9 % of this area

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

High Terraces (Pleistocene) at surface, covers 4 % of this area

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

Prairie Terraces (Pleistocene) at surface, covers 2 % of this area

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