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

Alluvium

gray to brownish gray clay and silty clay, reddish brown in the Red River Valley, some sand and gravel locally.
StateLouisiana
NameAlluvium
Geologic agePhanerozoic | Cenozoic | Quaternary | Holocene
Original map labelQal
CommentsIncludes all alluvial valley deposits except natural levees of major streams.
Primary rock typeclay or mud
Secondary rock typesand
Other rock typesgravel
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Clay (Alluvial)
Minor
Unconsolidated > Coarse-detrital > Gravel (Alluvial)
Unconsolidated > Coarse-detrital > Sand (Alluvial)
Map references
Snead, J. I., and Mcculloh, R. P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey. Scale 1: 500K.
Unit references
Snead, J. I., and Mcculloh, R. P., 1984, Geologic Map of Louisiana: Louisiana Geological Survey. Scale 1: 500K.
Geographic coverageAcadia - Allen - Ascension - Assumption - Avoyelles - Beauregard - Bienville - Bossier - Caddo - Calcasieu - Caldwell - Cameron - Catahoula - Claiborne - Concordia - De Soto - East Baton Rouge - East Carroll - East Feliciana - Evangeline - Franklin - Grant - Iberia - Iberville - Jackson - Jefferson - Jefferson Davis - Lafayette - Lafourche - La Salle - Lincoln - Livingston - Madison - Morehouse - Natchitoches - Orleans - Ouachita - Plaquemines - Pointe Coupee - Rapides - Red River - Richland - Sabine - Saint Bernard - Saint Charles - Saint Helena - Saint James - Saint John the Baptist - Saint Landry - Saint Martin - Saint Mary - Saint Tammany - Tangipahoa - Tensas - Terrebonne - Union - Vermilion - Vernon - Washington - Webster - West Baton Rouge - West Carroll - West Feliciana - Winn

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