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Coastal Sand Plains

Ecoregion of Texas

Kaitlyn Muniz

on 30 October 2012

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Transcript of Coastal Sand Plains

Characteritics of the land Erosion Deposition Of the land Texas are composed of grasslands coastal sand plain are fairly level of elevations less than 150FT sea level.Woody vegetation is more extensive now and than in pre-settlement times.The Virginia Coastal Plain is underlain by a thick wedge of sediments that increases in thickness from a featheredge near the Fall Zone to more than 4,000 meters under the continental shelf. These sediments rest on an eroded surface of Precambrian to early Mesozoic rock. Weathering are sediments formed coastal oak motts intermixed with Mesquite granjeno and salt marshes average annual rainfall is 24 to 28 inches and the soils are primarily windblown sands.Latest Tertiary and Quaternary sand, silt, and clay, which cover much of the Coastal Plain, were deposited during interglacial highstands of the sea under conditions similar to those that exist in the modern Chesapeake Bay and its tidal tributaries. Plain are more dissected by stream erosion than the lower, younger terrace treads.This landscape was formed over the last few million years as sea level rose and fell in response to the repeated melting and growth of large continental glaciers and as the Coastal Plain slowly uplifted. The risers (scarps) are former shorelines and the treads are emergent bay and river bottoms.Large tidal rivers, the Potomac, Rappahannock, York, and James, flow southeastward across the Coastal Plain to the Chesapeake Bay. The Bay, in turn, empties into the Atlantic Ocean. Coastal Sand Plains Weathering
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