Geologic units in Caldwell Parish, Louisiana

Additional scientific data in this geographic area

Cockfield Formation (Eocene) at surface, covers 33 % of this area

Brown lignitic clays, silts and sands; some sideritic glauconite may weather to brown ironstone in lower part.

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.

Natural Levees (Holocene) at surface, covers 19 % of this area

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

Prairie Terraces (Pleistocene) at surface, covers 9 % of this area

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

Jackson Group (undifferentiated) (Eocene) at surface, covers 9 % of this area

Light gray to brown liginitic clays with thin interbeds of limonitic sands or lignite; near base,calcareous, glauconitic, and fossiliferous beds may weather to black soil.

Braided Stream Terraces (Pleistocene) at surface, covers 0.9 % of this area

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

Intermediate Terraces (Pleistocene) at surface, covers 0.2 % of this area

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

Jackson Group (undifferentiated) (Eocene) at surface, covers < 0.1 % of this area

Light gray to brown liginitic clays with thin interbeds of limonitic sands or lignite; near base,calcareous, glauconitic, and fossiliferous beds may weather to black soil. Overlain by 1-9 meters of loess.