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
Walter S. Newman, Leonard J. Cinquemani, Jon A. Sperling, Leslie F. Marcus, Richard R. Pardi, 1987. "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", Sea-Level Fluctuation and Coastal Evolution, Dag Nummedal, Orrin H. Pilkey, James D. Howard
Download citation file:
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.
Figures & Tables
Sea-Level Fluctuation and Coastal Evolution - This Special Publication is the result of a symposium in honor of W. Armstrong Price held at the first SEPM Midyear Meeting at San Jose, California, on August 12, 1984. The factors controlling relative sea-level change along our shores are varied and, at best, imperfectly understood. Yet, the relative rate of change is what controls shoreline erosion, the arrangement of sedimentary facies of the coastal zone, and the character of deformities within the coastal stratigraphic record. Therefore, these papers address sea-level changes, shoreline responses, and the controls on the three-dimensional geometry of the consequent lithosomes; in short, the architecture of the coastal depositional systems.