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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.
StateLouisiana
NameCatahoula Formation
Geologic agePhanerozoic | Cenozoic | Tertiary | Oligocene
Original map labelOc-l
CommentsLower 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.
Primary rock typesandstone
Secondary rock typesand
Other rock typesvolcanic ash
Lithologic constituents
Map references
United States Geological Survey, 1998, Digital Overlay of the Geologic Map of Louisiana: U.S. Geological Survey, Biological Resources Division, National Wetlands Research Center, Product Id USGS-NWRC 1984-02-0001, http://www.nwrc.usgs.gov/.
Unit references
United States Geological Survey, 1998, Digital Overlay of the Geologic Map of Louisiana: U.S. Geological Survey, Biological Resources Division, National Wetlands Research Center, Product Id USGS-NWRC 1984-02-0001, http://www.nwrc.usgs.gov/.
Geographic coverageCatahoula

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=LAOGc-l;0
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