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Mineral Resources > Online Spatial Data > Geology > by state > Louisiana Geology

Geologic units in De Soto Parish, Louisiana

alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers < 0.1 % of this area

alluvium

Lithology: sand; silt; clay or mud; gravel

Prairie Terraces (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 8 % of this area

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

Lithology: clay or mud; silt; sand; gravel

Wilcox Group, undivided (Phanerozoic | Cenozoic | Tertiary | Paleocene Eocene) at surface, covers < 0.1 % of this area

Wilcox Group, undivided

Lithology: fine-grained mixed clastic; coal; sand; clay or mud

Intermediate Terraces (Phanerozoic | Cenozoic | Quaternary | Pleistocene) at surface, covers 0.7 % of this area

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

Lithology: clay or mud; silt; sand; gravel

Natural Levees (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 3 % 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

Wilcox Group (undifferentiated) (Phanerozoic | Cenozoic | Tertiary | Paleocene) at surface, covers 65 % of this area

gray to brown lignitic sands and silty to sandy lignitic clays, many seams of lignite; some limestone and glauconite.

Lithology: sand; clay or mud; coal; limestone

Alluvium (Phanerozoic | Cenozoic | Quaternary | Holocene) at surface, covers 21 % 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

Terrace deposits (Phanerozoic | Cenozoic | Quaternary | Pleistocene Holocene) at surface, covers < 0.1 % of this area

Terrace deposits

Lithology: terrace; sand; gravel; silt; clay or mud