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

High Terraces

tan to orange clay, silt, and sand with a large amount of basal gravels. Overlain by 1-9 meters of loess.
StateLouisiana
NameHigh Terraces
Geologic agePhanerozoic | Cenozoic | Quaternary | Pleistocene
Original map labelQth-l
CommentsSurfaces are highly dissected and less continuous than lower terraces. Composed of terraces fomerly designated as Williana, Citronelle, and the highest Bentley. 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 typeclay or mud
Secondary rock typesilt
Other rock typessand; gravel
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 coverageEast Feliciana - Rapides - West Feliciana

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