Geologic units in Avoyelles Parish, Louisiana

Additional scientific data in this geographic area

Natural Levees (Holocene) at surface, covers 45 % of this area

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

Alluvium (Holocene) at surface, covers 37 % 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 12 % of this area

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

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

Light gray, tan and brown fine to coarse sand; some clay silt and gravel.

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

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