Witte Hi Pt S P Geology

The base of the steep slope east of the road and

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Unformatted text preview: this valley, its waters draining westward across a low GATE bedrock-floored outlet. Further PARKING PICNIC glacial retreat uncovered a lower 0 2/10 CEDAR AREA mile SWAMP PICNIC RD outlet north of the area now marked AREA SER by the New Jersey - New York State TO 23 KURD TO MONUMENT line. During this time, the lake drained northeastward over a plug of thick till. Its water level lowered by as much as 20 feet, but it did not completely drain. The lake persisted well into recent time before decayed vegetation filled it in, forming a swamp. The bouldery area along the swamp’s modern outlet is called a lag deposit. It was formed by the small stream that drained the lake, which eroded the fine-grained sediment from the till it was flowing over, leaving behind the heavier stones. The lower part of the slope on the east side of the swamp consists of a thin layer of till. In a few places, bedrock is very close to the surface, as shown by irregular areas of angular boulders. Large outcrops of Shawangunk Formation form the upper part of the slope. These rocks dip to the southeast, and below them lies a narrow apron of conglomerate and quartzite talus. Bedding on the lower part of the hillslope dips northwestward, which shows that the talus apron conceals an anticlinal fold axis. Figure 19 shows the change in forest cover around High Point from the close of the last ice age to the present; a period of 11,000 years. It is based on a pollen diagram of a core retrieved from Cedar Swamp. The lower part of the record shows that spruce and pine formed the dominant forest cover. The high percentage of spruce, which favors a climate much cooler than that now present at High Point, shows that the forest cover 10,000 years ago was similar to the presentday forests of northern Maine and southern Canada. Higher up in the record, a rise in the percentage of oak, accompanied by decreasing pine and disappearance of spruce, record the transition to a temperate forest of mixed hardwoods dominated by oak. The predominance of oak at the 14-fo...
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This document was uploaded on 03/21/2014 for the course GEOL 3265 at Kean.

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