Witte Hi Pt S P Geology

37 other occurrences throughout the park talus made up

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Unformatted text preview: rk here STATE PARK BDY Location - Port Jervis quadrangle, Ridge Road. 0 1/2 mile D LR MIL SAW Explanation - In this part of the park , thick deposits of till cover the Bloomsburg Red Beds, masking 2.3 miles STOP 8 the topography of the buried rock crest of Augusta Moraine surface. This part of Kittatinny k B ers Shim Mountain lies along a thick TO SAWMILL RD belt of glacial drift that extends northeastward from Culvers Gap to the New Jersey-New York boundary. Many of the hills in this belt are drumlins. They are elongated in a direction parallel to glacier flow and formed where the glacier streamlined pre-existing surficial material or molded till at its base. Drumlins in the park trend due south to south 15o west, a direction much more southerly than showed by nearby striations. This suggests the drumlins were made when the ice was much thicker, and its flow not as controlled by topography as it was when the striations were made. 38 The many swamps and poorly-drained areas are typical of constructional glaciated landscapes. Thick till deposited in drumlins, ground moraine, and recessional moraine has completely buried the preglacial surface concealing former stream courses. Upon deglaciation, surface water, which had formerly flowed off the mountain in a well defined network of streams, became trapped in the many depressions, lakes, and ponds that dotted parts of the mountain. As time passed, streams expanded their drainage areas slowly by headward erosion. Although more than 18,000 years have passed since the last ice sheet left, the land retains its glacial imprint. South of stop 8, Park Ridge Road follows the crest of the Augusta moraine for about a mile. Morainal topography is well expressed along this stretch of the road. The two large swamps on either side of the moraine are former glacial lakes, now filled with sediment and decayed vegetation. The lakes formed when the glacier margin retreated northward from the Augusta and Montague moraines, ponding meltwater in the low area between the front of the ice sheet and the...
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