Gray to brown lignitic sands and silty to sandy lignitic clays, many seams of lignite; some limestone and glauconite.
Gray and brown silt, silty clay, some very fine sand, reddish brown along the Red River.
Gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
Light gray to light brown clay, sandy clay, silt, sand, and some gravels.
White to light gray massive sands with interbedded clays; some thin beds of lignite or lignitic sands and shales.
Brown silty clay with basal glauconitic, fossiliferous silts which may weather to ironstone locally.
Gray mixed with brown-to-red clay and silty clay; some sand and gravel locally.
Dark gray to black shale
Wilcox Group, undivided
Queen City Sand
Quaternary deposit, undivided
Alluvial deposits of present streams