Catahoula Formation

Gray to white sandstones; loose quartz sand, tuffaceous sandstone, volcanic ash, and brown sandy clays; petrified wood locally. Overlain by 1-9 meters of loess.
State Louisiana
Name Catahoula Formation
Geologic age Oligocene
Lithologic constituents
Unconsolidated > Coarse-detrital > Sand
Sedimentary > Clastic > Sandstone (Bed)
Unconsolidated > Fine-detrital > Silt (Eolian-loess)
Igneous > Volcanic (Pyroclastic-air fall)
Unconsolidated > Fine-detrital > Clay (Bed)
Comments Lower member of the Fleming FM. Where overlain by loess, this unit has a red dotted overlay pattern on the source map. Polygons for this unit in our coverage which should have the loess overlay pattern are designated by "-l" being added to the base map unit symbol.

Snead, J.I., and Mcculloh, R.P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey, scale 1:500,000.

NGMDB product
Counties Catahoula