description Atlantic Coastal Plain Overview
The Atlantic Coastal Plain is a low-lying physiographic region along the eastern United States, extending from southern Florida northward to Long Island and New York. It consists largely of seaward-dipping and generally unconsolidated layers of sand, gravel, silt, clay, and marl deposited from the Mesozoic onward, and it meets the Piedmont near the Fall Line.
help Atlantic Coastal Plain FAQ
Where does the Atlantic Coastal Plain extend?
The Atlantic Coastal Plain runs along the eastern United States from southern Florida northward to Long Island and New York. It includes coastal and near-coastal lowlands rather than one single state.
What rocks and sediments make up the Atlantic Coastal Plain?
The region is largely built from seaward-dipping, unconsolidated layers of sand, gravel, silt, clay, and marl. These sediments were deposited over long periods near the Atlantic margin.
Is the Atlantic Coastal Plain mountainous?
No. It is a low-lying physiographic region, with generally gentle relief compared with the Appalachian Mountains farther inland.
How is the Atlantic Coastal Plain different from the Piedmont?
The Coastal Plain lies closer to the Atlantic coast and is dominated by younger, loose sediments. The Piedmont is an inland upland region with older crystalline rocks and more varied relief.
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