Prairie Terraces (LAQtp-l;0)

State	Louisiana
Name	Prairie Terraces
Geologic age	Phanerozoic \| Cenozoic \| Quaternary \| Pleistocene
Original map label	Qtp-l
Comments	Surfaces generally show little dissection and are topographically higher than the Deweyville. Three levels are recognized:two along alluvial valleys, the lower coalescing with its broad coastwise expression;the third, still lower, found intermittently gulfward. 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 type	clay or mud
Secondary rock type	silt
Other rock types	sand; 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/. [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/. [http://www.nwrc.usgs.gov/.]
Geographic coverage	Acadia - Ascension - Avoyelles - East Baton Rouge - East Feliciana - Evangeline - Iberia - Lafayette - Livingston - Morehouse - Ouachita - Rapides - Saint Landry - Saint Martin - Saint Mary - Vermilion - West Feliciana