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Generalized Geologic Map of the Conterminous United States
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  The North American Tapestry of Time and Terrain

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Mississippi River Alluvial Plain


Close-up of
 gulf coast

A conspicuous band of Quaternary (gray) deposits characterize the broad, flat alluvial plain of the Mississippi River Embayment, its tributaries to the west, and coastal Texas. The rocks in the alluvial plain owe their origin to extensive and accelerated deposition by streams during interglacial phases of the Pleistocene, followed by erosion of these materials by Holocene river systems, over the last 1-2 million years.