2011 GSA Annual Meeting in Minneapolis (9–12 October 2011)
Paper No. 44-3
Presentation Time: 9:00 AM-6:00 PM

POSSIBLE EVIDENCE OF “PARACONFORMITY” BETWEEN THE MANHATTAN SCHIST AND THE INWOOD MARBLE, NEW YORK CITY

SCHLEIFER, Stanley1, KHANDAKER, Nazrul I.1, SHAMI, Malek1, CHATURGAN, Thakur2, and CHARLES, Adisa3, (1) Geology Discipline, Earth and Physical Sciences, York College Of CUNY, 94-20, Guy R. Brewer Blvd, Jamaica, NY 11451, schleifer@york.cuny.edu, (2) Brown and Caldwell, 110 Commerce Drive, Allendale, NJ 07401, (3) Geology Discipline, Earth & Physical Sciences, York College Of CUNY, 94-20 Guy R. Brewer Blvd, Jamaica, NY 11451

At the very northwestern tip of Manhattan Island, in the shadow of the Henry Hudson Bridge, one can observe, at times of low tide, by the shore of the ‘Spuyten Duyvil’, an apparently conformable contact between the outcrop of the Inwood Marble (Mg-calcite rich, commonly dolomitic, often exhibiting saccharoidal texture and insoluble silicates such as tremolite, chlorite, and muscovite) and an overlying schist. It is dominantly muscovite-biotite (phlogopite) schist, garnetiferous in places. This overlying schist has been presumed by many geoscientists working in the New York City area to be the Manhattan Schist. This, however, is problematic because the age of the Manhattan Schist is late Proterozoic to Cambrian and the Inwood Marble, considered to be a member of the Stockbridge Formation as mapped in New England, is Cambrian to Ordovician in age (Bedrock Geological Map of Connecticut, Rodgers, 1985). This implies that either the overlying schist or the underlying marble have been misidentified as to age which is unlikely, or that subsequent tectonic processes, such as over thrusting during the Taconic Orogeny, have juxtaposed the older Manhattan Schist over the Inwood Marble. The authors suggest that the appearance of conformity or paraconformity is the result of subsequent deformation of the fault surface during the Acadian Orogeny.

2011 GSA Annual Meeting in Minneapolis (9–12 October 2011)
General Information for this Meeting
Session No. 44--Booth# 306
Student-Involved Research Experience in Earth-System Science: An Effective Tool for Recruitment and Retention in the Geosciences (Posters)
Minneapolis Convention Center: Hall C
9:00 AM-6:00 PM, Sunday, 9 October 2011

Geological Society of America Abstracts with Programs, Vol. 43, No. 5, p. 129

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