The Ramapo Fault

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The Ramapo Fault
Chapter 3 Times of Change The
Piedmont Province
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When compared to the low-relief topography of the
surrounding land the basalt ridges stand in
moderate relief and were called mountains by the
early European colonists. The two thicker
basalt formations, the Orange Mountain Basalt and
the Preakness Basalt form a parallel set of
ridges named The First and Second Watchung
Mountains as shown in the following slide.
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Dam
This exaggerated topographic view
shows the diabase ridge that encloses
the reservoir. The reservoir was created by
building dams across the northern
end of the valley formed by the diabase. It is
filled by pumping in water from
the South Branch of the Raritan River during wet
periods and then releasing it in
dry periods to supply downstream communities.
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The rocks found in the Piedmont Province of New
Jersey record a remarkable segment of Earth
history spanning some 24 million years. The
Province marks a part of a great change of the
Earth - the breakup of the supercontinent Pangaea.
The Province contains a remarkable history of
climatic, sedimentary, igneous, and life history
not found elsewhere. And its right here -
beneath our feet!
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References
Drake, Avery Ala, Jr., Richard A. Volkert,
Donald H. Monteverde, Gregory C. Herman, Hugh F.
Houghton, Ronald A. Parker, and Richard F.
Dalton, 1996, Bedrock Geologic Map of Northern
New Jersey U.S. Geological Survey
Miscellaneous Investigations Series Map
I-2540-A Dunning, G.R.,, and Hodyich, J.P.,
1990, U/Pb zircon and baddeleyite ages for the
Palisades and Gettysburg sills of the
northeastern United States Implications for the
age of the Triassic-Jurassic boundary
Geology, v. 18, p.795-798. Husch, Jonathan M.,
Thomas C. Bambrick, W. Mark Eliason, Eric A.
Roth, Reed A. Schwimmer, Douglas S.
Sturgis, and Charles W. Trione, 1988, A review
of the petrology and geochemistry of
Mesozoic diabase from the Central Newark Basin
New Petrogenetic Insights in, Geology of
the Central Newark Basin. Field Guide and
Proceedings of the Fifth Annual Meeting of the
Geological Association of New Jersey, Oct.
7-9, 1988, p. 149-194. Olsen, Paul E, and D.
Baird, 1986, The ichnogenus Atreipus and its
significance for Triassic bio- stratigraphy
in the Beginnings of the Age of Dinosaurs faunal
change across the Triassic- Jurassic
boundary Kevin Padian (ed.), Cambridge
University Press, N.Y., p. 61-87. Olsen, Paul
E., 1988, Continuity of strata in the Newark and
Hartford basins in Studies of the Early
Mesozoic Basins of the Eastern United States U.
S. Geological Survey Bulletin 1776, p.
xxxxxxx Olsen, P. E., S.J. Fowell, and B.
Cornet, 1990, The Triassic/Jurassic boundary in
continental rocks of eastern North America
A progress report Geological Society of America
Special Paper 247, p. 585-593.
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References (cont) Olsen, Paul E., Dennis V.
Kent, Bruce Cornet, William k. Witte, and Roy W.
Schlische, 1996, High-resolution
stratigraphy of the Newark rift basin (early
Mesozoic, eastern North America) Geological
Society of America Bulletin, v. 108, no.1, p.
40-77. Puffer, John H., Alexander E. Gates,
Ralph E. Costa, Richard A. Volkert, and Thomas
D. Gillespie, 1993, Field Guide to a
Geologic Traverse Across the Precambrian of the
New Jersey Highlands in Geologic
Traverse Across the Precambrian Rocks of the New
Jersey Highlands. Field Guide and
Proceedings of the 10th Annual Meeting of the
Geological Association of New Jersey
Guidebook GANJ, Oct. ???, 1993, p. 1-22.
Sutter, J.F., 1988, Innovative approaches to
dating igneous events in the early Mesozoic
basins, eastern North America, in Froelich,
A.J., and Robinson, G.R., eds., Studies of the
early Mesozoic basins of the eastern United
States U.S. Geological Survey Bulletin, 1776,
p. 194- 200. Witte, William K., Dennis V.
Kent, and Paul E.Olsen, 1991, Magneto-stratigraphy
and paleomagnetic poles from
Late-Triassic-Earliest Jurassic strata of the
Newark basin Geological Society of
America Bulletin, v. 103, p. 1648-1662. Note
Not cited in the text is an excellent, highly
detailed and technical web-site discussion of
the Piedmont by Prof. Roy Schlische
at Rutgers University, New Brunswick.
------http//geology.rutgers.edu/103web/103home.ht
ml Geology of the Newark Basin