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Holocene Neotectonics and the Ramapo Fault Zone Sea-Level Anomaly: A Study of Varying Marine Transgression Rates in the Lower Hudson Estuary, New York and New Jersey

By
Walter S. Newman
Walter S. Newman
Department of Geology, Queens College of the City University of New York, Flushing, New York 11367
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Leonard J. Cinquemani
Leonard J. Cinquemani
Department of Geology, Queens College of the City University of New York, Flushing, New York 11367
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Jon A. Sperling
Jon A. Sperling
Department of Biology, Queens College of the City University of New York, Flushing, New York 11367
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Leslie F. Marcus
Leslie F. Marcus
Department of Biology, Queens College of the City University of New York, Flushing, New York 11367
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Richard R. Pardi
Richard R. Pardi
Radiocarbon Laboratory, Queens College of the City University of New York, Flushing, New York 11367
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Published:
January 01, 1987

Abstract:

Eleven tidal marsh stations along the lower Hudson River estuary yield contrasting marine transgression rates: more than 2.0 m/millennium at New York City compared to about 1.0 m/millennium 100 km to the north at Marlboro near Poughkeepsie. The entire area appears to be tilting downward to the south-southeast. Three tidal marsh stations within the Ramapo Fault Zone (RFZ) yield higher transgression rates as compared to the other stations beyond the limits of the RFZ. This anomaly seems best explained by complex graben-like downfaulting, with a throw of at least 1 m having occurred within the past 2 millennia. There is also evidence, based on radiocarbon dating, of earlier fault movement after about 4.2 ka, suggesting a recurrence interval on the order of 2,000 yrs. The displacements inferred from these varying transgression rates may result from faults whose traces do not intersect the earth's surface.

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SEPM Special Publication

Sea-Level Fluctuation and Coastal Evolution

Dag Nummedal
Dag Nummedal
Department of Geology and Geophysics Louisiana State University, Baton Rouge, Louisiana
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Orrin H. Pilkey
Orrin H. Pilkey
Department of Geology Duke University, Durham, North Carolina
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James D. Howard
James D. Howard
Skidaway Institute of Oceanography Savannah, Georgia
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SEPM Society for Sedimentary Geology
Volume
41
ISBN electronic:
9781565760950
Publication date:
January 01, 1987

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