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Geologic Map
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

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Legend and Rock Ages
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Mississippi River Delta


Close-up of
 Mississippi River DeltaThe giant bird's foot delta, featuring a large middle toe, that terminates the lower Mississippi River in southern Louisiana marks the seaward growth of land into the Gulf of Mexico. The Mississippi-Missouri River system collects eroded debris from the central U.S. Upon reaching the Gulf, the river's velocity slows, abruptly reducing its capacity to carry suspended mud and sand, and the sediment is deposited in vast alluvial fans not visible on the map. These submarine fans are major sources of petroleum, natural gas, and sulfur.