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AGS / Education / Geology Resources / Physiographic Regions / Mississippi River Alluvial Plain / Geology


The geology of the Mississippi River Alluvial Plain is characterized by unconsolidated flat-lying alluvium from present day and older streams, overlying poorly consolidated Tertiary formations that are dipping slightly to the south.

Quaternary terrace sand and gravels on top of Crowleys Ridge

Quaternary terrace sand and gravels on top of Crowley’s Ridge



Tertiary Deposits

Tertiary deposits


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Arkansas Geological Survey
Vardelle Parham Geology Center
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Little Rock, AR 72204
Phone: 501-296-1877 | Fax: 501-663-7360
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