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The tidewater region developed when sea level rose after the last ice age, resulting in the flooding of river valleys in the coastal plain. Such flooded river valleys now make up the tidewater since tides continue to affect water levels far inland, in some cases all the way west to the Fall Line.
In the early Mesozoic, the rifting apart of the supercontinent Pangaea to form the Atlantic Ocean, created large rift basins, which filled with sediments—ultimately forming the Atlantic Coastal Plain. The oldest basins in Virginia date to the Triassic and Jurassic. The Cretaceous rocks of the Potomac Group cover these older sedimentary rocks.
Virginia is divided into five geographic regions. Geologically, Virginia is divided into five regions, [5] while the EPA lists seven ecoregions with further precision. From east to west, the regions are as follows: The Tidewater is a coastal plain between the Atlantic coast and the Fall Line.
The York River is a navigable estuary, approximately 34 miles (55 km) long, [4] in eastern Virginia in the United States. It ranges in width from 1 mile (1.6 km) at its head to 2.5 miles (4.0 km) near its mouth on the west side of Chesapeake Bay. Its watershed drains an area of the coastal plain of Virginia north and east of Richmond.
Lake Drummond is a freshwater lake at the center of the Great Dismal Swamp, a marshy region on the Coastal Plain of southeastern Virginia and northeastern North Carolina between Norfolk, Virginia, and Elizabeth City, North Carolina, in the United States.
The Great Dismal Swamp is a large swamp in the Coastal Plain Region of southeastern Virginia and northeastern North Carolina in the eastern United States, between Norfolk, Virginia, and Elizabeth City, North Carolina. [1]
The Virginia Piedmont is largely characterized by rolling hills and numerous ridges near the boundary with the Blue Ridge Mountains. Lying between the mountain and coastal plain regions, the Piedmont region is a naturally diverse landscape. [2] The bedrock consists mostly of gneiss, schist, and granite rocks at a typical depth of between 2 and ...
Chesapecten jeffersonius is the fossilized form of an extinct scallop, which lived in the early Pliocene epoch between four and five million years ago on Virginia's coastal plain. Chesapecten jeffersonius are commonly found in strata exposed along Coastal Plain cliffs along major rivers in southeastern Virginia and eastern North Carolina, and ...