Witte Hi Pt S P Geology

Over time the mountains were lowered by erosion the

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Unformatted text preview: rg Formation. Following deposition of the Martinsburg sediments, the entire region was again uplifted and the landmass again slowly eroded. This period lasted about 25 million years and marks the Taconic Unconformity, a regional surface that displays evidence of extensive erosion. Eventually, a westward facing coastal plain formed at the base of the mountains that became covered by stream deposits. These deposits make up the Shawangunk Formation. As sea level rose slightly, sediments laid down in muddy tidal flats and shallow marine waters that now make up the Bloomsburg Red Beds were deposited on the Shawangunk sediments. As the continental margin further subsided, seas eventually covered the Bloomsburg Red Beds. Carbonate materials were deposited in this calm shallow-marine environment. These carbonate rocks now lie just west of the park. 11 Between 410 and 380 million years ago a second period of mountain building occurred. This event, called the Acadian Orogeny, also involved several smaller continental plates colliding with the North American plate. This orogeny, responsible for New England’s major structural features, is not represented in the rocks in High Point State Park. A third period, called the Alleghany Orogeny, occurred between 330 and 250 million years ago. Intense folding and faulting of the park’s rocks mark this collision of the North American continent with the African continent. EVOLUTION OF REGIONAL LANDFORMS The landscape around High Point State Park was shaped by many geologic processes acting throughout millions to tens of millions of years. These processes included uplift and subsidence of the earth’s crust, physical and chemical weathering, erosion by streams, and mass wasting. Some geologists believe that the present landscape had its beginnings in Permian or Triassic time when a large river system flowed westward toward the continental interior (the area now drained by the Mississippi River and its tributaries). When continental rifti...
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This document was uploaded on 03/21/2014 for the course GEOL 3265 at Kean.

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