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Witte Hi Pt S P Geology

View to the northeast along the curving ridge line of

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Unformatted text preview: ears has created a rugged landscape that remains largely uncultivated. The Delaware River drains southeastward from the Pocono Plateau to the towns of Matamoras, Pennsylvania, and Port Jervis, New York. Here the river enters Minisink Valley, makes a right-angle turn and continues its course to the southwest. 150 PA R 0 CONCESSION feet ME NT DR IV E STOP 4 HIGH POINT MON. NU Geology - Surficial - Glacial erosion, striations, crescentic marks, polishing, roche moutonnées, and plucking. Bedrock - Shawangunk Formation. REST ROOMS N MO Location - Port Jervis South quadrangle, Kittatinny Mountain, northeast side of High Point Monument. KI NG Stop 4 Explanation - Excellent examples of striations can be seen on the TO 23 glacially polished rock surface (fig. 17) northeast of the monument. They consist of straight scratches and larger grooves that show the glacier flowed south 85o west to due west. Crescentic marks (fig. 18) are also well developed; they show a similar direction of ice flow. The westerly direction of ice flow exhibited here shows that these glacial markings were made near the glacier margin where ice flow was controlled by the lobate geometry of the Kittatinny Valley lobe. In places weathering has obliterated the striations and roughened the polished rock surface. This suggests that these features were once covered by thin till, which may have lessened the effects of weathering. Later, the till was stripped by erosion. When viewed from a distance the rock outcrops have a streamlined and asymmetrical, 30 bronze survey disk striations pencil (for scale), parallel to striation FIgure 17. Stop 4: Striations on the Shawangunk formation just north of the monument. They show that ice flowed westward (toward top of photo) across Kittatinny mountain. pencil (for scale) direction of ice flow crescentic marks Figure 18. Stop 4: Crescentic marks (a few highlighted on photo) on the Shawangunk Formation just north of the monument. They show a similar direction of glacial flow as nearby striations. 31 smoothed shape. On the downstream side (west and southwest), rock has been removed by glacial plucking and quarrying. On the upstrea...
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