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

Intermediate Terraces

light gray to orange-brown clay, sandy clay, and silt; much sand and gravel locally.
StateLouisiana
NameIntermediate Terraces
Geologic agePhanerozoic | Cenozoic | Quaternary | Pleistocene
Original map labelQti
CommentsSurfaces show more dissection and are topographically higher than the Prairie. Composed of terraces formerly designated as Montgomery, Irene, and most of the Bentley.
Primary rock typeclay or mud
Secondary rock typesilt
Other rock typessand; gravel
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Terrace, stream)
Unconsolidated > Fine-detrital > Clay (Terrace, stream)
Minor
Unconsolidated > Coarse-detrital > Gravel (Terrace, stream)
Unconsolidated > Coarse-detrital > Sand (Terrace, stream)
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 coverageAllen - Beauregard - Bienville - Bossier - Calcasieu - Caldwell - Catahoula - De Soto - Evangeline - Grant - Jefferson Davis - La Salle - Livingston - Natchitoches - Rapides - Red River - Sabine - Saint Helena - Tangipahoa - Union - Vernon - Webster - Winn

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