Witte Hi Pt S P Geology

Witte Hi Pt S P Geology

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Unformatted text preview: ng opened the Atlantic Ocean more than 200 million years ago, in late Triassic time, newly formed streams along the coast worked their way inland and captured parts of the inland drainage. As time passed, streams flowing over weaker rock cut valleys faster and deeper than those flowing over tough, harder rock. Because belts of rock trend northeastward in northwestern New Jersey, drainage developed along northeast- to southwest-trending belts of weaker rock. In some places, hard, resistant rocks were weakened by faults or numerous joints. Streams cut through these resistant ridges at their weakened points and formed features like Delaware Water Gap and Culvers Gap. Other geologists think that the ancestral Appalachian Mountains were worn low and subsequently covered by a thick layer of coastal plain sediments more than 100 million years ago during the Mesozoic Era. Newly formed streams, which flowed southeastward following the seaward slope of the land, cut their drainage inland from the Atlantic Ocean. Following a lengthy period of erosion, the underlying folded and faulted rocks of the Appalachians were exposed and streams began to adjust to the rock’s structure. Water gaps were eroded in places where southeast flowing rivers first encountered the resistant rocks that make up the modern uplands such as Kittatinny Mountain. 12 The principal landscape features of the park probably formed during the late Tertiary period (10 to 25 million years ago). During this time, erosion and valley cutting accelerated when sea level fell due to the growth of the Antarctic ice sheet, and possible uplift of the earth’s crust. Rejuvenated streams eroded the old land surface, deepening valleys and water gaps and further adjusting their courses along belts of weak rock. It was probably during this time that a stream flowing in what is now Culvers Gap was intercepted and captured by a tributary of the Delaware River. THE ICE AGE Regional History During the Pleistocene Epoch (2 million to 10 thousand years ago) ice sheets adv...
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This document was uploaded on 03/21/2014 for the course GEOL 3265 at Kean.

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