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Unformatted text preview: tands out in greater relief than the area on its flanks,
which is underlain by softer rocks. The small notch near the
ridge’s midpoint is Culvers Gap, which was cut by an ancestral
stream of the Raritan or Delaware Rivers.
View to the east across Kittatinny Valley.
The uplands visible across Kittatinny Valley include Pochuck
Mountain, Mount Adam, Mount Eve, and the New Jersey Highlands.
These areas are all chiefly underlain by granite and gneiss, rocks
28 Culvers Gap Figure 16. Stop 3: Vista from High Point Monument looking southwestward along
the curving ridgeline of Kittatinny Mountain. The small notch along the midline of
the ridge is Culvers Gap. that are more than 570 million years. Kittatinny Valley forms the
broad lowland between the Highlands and Kittatinny Mountain. Its
upper part is drained by the Wallkill River, which flows northward
and empties into the Hudson River just south of Kingston, New
York. Its lower part is drained by the Pequest River and Paulins
Kill, which flows southwest to the Delaware River. The valley is
underlain by slate and sandstone of the Martinsburg Formation
and limestone and dolomite of the Kittatinny Supergroup. The
higher ridges and hills in the valley are underlain by slate and
sandstone, which are more resistant to weathering than limestone
and dolomite. Overall, the rocks that underlie Kittatinny Valley are
much less resistant to weathering and erosion than the rocks that
underlie the New Jersey Highlands and Kittatinny Mountain.
View to the northeast along the curving ridge line of Kittatinny
The broad upland at northeast end of ridge is the Shawangunk
Mountains. The Catskill Mountains, which can be seen only on a very
clear day, form a high, jagged upland west of the Shawangunks. 29 View northwest across Minisink Valley to the Pocono Plateau.
The uneven upland in the distance is the Pocono Plateau, an area
underlain by gently-northwest-dipping, limestone, shale, and
sandstone. Extensive erosion of these rocks over millions of y...
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