- Atlantic Plain
The Atlantic Plaincite web |title=Physiographic divisions of the conterminous U. S. |publisher=U.S. Geological Survey |url=http://water.usgs.gov/GIS/metadata/usgswrd/XML/physio.xml |accessdate=2007-12-06 ] is one of eight distinct
United States physiographic regions. This major division consists of the Continental Shelfand Coastal Plainphysiographic provinces. It is the flattest of the U.S. physiographic divisions and stretches over convert|2200|mi|km in length from Cape Codto the Mexican border and southward another convert|1000|mi|km to the Yucatán Peninsula. The central and southern Atlantic Coastis characterized by barrier and drowned valley coasts. The coastal Atlantic plain features nearly continuous barriers interrupted by inlets, large embayments with drowned river valleys, and extensive wetlands and marshes. [cite web |last=|first=| authorlink = | coauthors = |title=Programmatic Environmental Assessment for the Emergency Forestry Conservation Reserve Program |publisher=U.S. Department of Agriculture, Farm Service Agency |date=|url=http://www.fsa.usda.gov/Internet/FSA_File/efcrp_pea.pdf |accessdate=2007-12-30 ] The Atlantic plain slopes gently seaward from the inland highlands in a series of terraces. This gentle slope continues far into the Atlantic and Gulf of Mexico, forming the continental shelf. The relief at the land-sea interface is so low that the boundary between them is often blurry and indistinct, especially along stretches of the Louisianabayous and the Florida Everglades.
The Coastal Plains
This province consists of the following physiographic sections: the Embayed, Sea Island, Floridian, East Gulf Coastal Plain,
Mississippi Alluvial Plain, and the West Gulf Coastal Plain. The "rocks" consist for the most part of layers of sand and clay which are not yet hardened into sandstone and shale. The surface is generally flat.
The Atlantic Plain is generally gently dipping undeformed
Mesozoicand Cenozoicsediments, with the sedimentary wedge thickening toward the sea, reaching a maximum thickness of about 3 kilometers (10,000 ft) in the vicinity of Cape Hatteras, N.C. [cite web |last=Renner |first=J. L. | authorlink = | coauthors = Vaught, Tracy L. |title=Geothermal Resources of the Eastern United States |publisher=U.S. Department of Energy, Division of Geothermal Energy |date=1979 |url=http://www.osti.gov/energycitations/servlets/purl/6630154-xpXBci/6630154.PDF |accessdate=2007-12-27 ]
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