Witte Hi Pt S P Geology

Stop 4 striations on the shawangunk formation just

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Unformatted text preview: m side (east and northeast sides), rock has been removed by abrasion. This gives the outcrop a characteristic sheepback or whaleback shape called a roche montonnée. The Shawangunk Formation here dips southeastward and forms the eastern limb of an arch or anticline, the same one as that described at Stops1 and 2. The steeper dip of the rock layers, the white quartz veins that cut across the bedding, and some small faults show that the rock here has been more strongly deformed than those at the previous stops. Other occurrences - Most rock outcrops in the park show the effects of glacial erosion. Striations and crescentic marks are best preserved where the rock retains its glacial polish. Quartz veins and small faults are found in the beds that were tightly bent during folding and in beds that were overturned. 0.0 mi/1.6 mi 0.5 mi/2.1 mi 0.3 mi/2.4 mi From Stops 3 and 4, exit parking area via Monument Drive. Turn right, follow sign to Dryden Kuser Natural Area. Gate. Park on paved area on right. Walk to Stop 5. Stop 5 Location - Port Jervis South quadrangle, Cedar Swamp, Dryden Natural Area. Park in area near locked gate. Proceed northeast about 1200 feet along abandoned road to plaque just beyond pillars. Here Kuser Trail may be traveled to bypass the swamp, or for a shorter route follow the boardwalk cutoff. The abandoned road cuts through an area of thin till and bedrock outcrop. Many of the outcrops exhibit evidence of glacial erosion in their overall streamlined form and lightly weathered surfaces. The base of the steep slope east of the road and swamp is covered by a thin narrow apron of talus. Geology - Surficial - Swamp deposits, till, talus. Bedrock - Numerous outcrops of Shawangunk Formation. 32 TR AIL KU SE R TR A IL BO Explanation - Cedar Swamp A WA RD LK KUSER occupies a north-draining valley NATURAL CEDAR AREA eroded by glacial ice along the hinge line of an anticlinal axis in the SWAMP Shawangunk Formation. During PLAQUE retreat of the last ice sheet about N STOP 5 18,000 years ago, a small glacial PILLAR PILLAR lake flooded...
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This document was uploaded on 03/21/2014 for the course GEOL 3265 at Kean.

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