Geologic units in Pointe Coupee Parish, Louisiana

Natural Levees (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 60 % of this area: gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.
Lithology: silt; clay or mud; sand
Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 36 % of this area: gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Lithology: clay or mud; sand; gravel