2006 Philadelphia Annual Meeting (2225 October 2006)
Paper No. 26-12
Presentation Time: 8:00 AM-12:00 PM

SEDIMENTOLOGY OF THE HIGH FALLS SHALE (SILURIAN), ROSENDALE, NY

MCPHERSON, Ryan1, SCHLEIFER, Stanley2, KHANDAKER, Nazrul I.2, MOLTENI, Edward A.2, NICASIO, Micheal1, and KISSOON, Sasha2, (1) Natural Sciences, York College (The City University of New York), 94-20 Guy R. Brewer Boulevard, Jamaica, NY 11451, McPherson@york.cuny.edu, (2) Natural Sciences Department, York College of CUNY, 94-20 Guy R. Brewer Blvd, Jamaica, NY 11451

The Upper Silurian High Falls Shale (HFS) is predominantly a red to brown shale, often containing thin arenaceous components, which outcrops extensively in Rosendale, NY area. It overlies the Upper Silurian Shawangunk Conglomerate (SC), and unconformably overlies the Ordovician Hudson River Shale (HRS) where the Shawangunk Conglomerate is absent. A distinct angular unconformity between the HFS and the HRS is observed in the Rosendale area. However, in the southern part of the Rosendale area, the HFS rests conformably over the SC. Near the Williams Lake Hotel, the outcropping surface of the HFS shows evidence of Pleistocene glacial activity in the form of well-preserved striations and grooves. The HFS is highly deformed and shows pronounced development of slaty cleavage. The deformation is attributed to the Acadian orogenic event. Primary hydrodynamic sedimentary structures along with conspicuous development of penecontemporaneous slumping indicate a shallow water terrigenous environment with intermittent influx of sand in a predominantly low energy depositional setting. At least two calcitic horizons of varying thickness, up to 50 cm. at the maximum, are observed within the shaly units. The origin of these calcitic bands in Rosendale area is under investigation.

2006 Philadelphia Annual Meeting (2225 October 2006)
General Information for this Meeting
Session No. 26--Booth# 110
An Early Involvement of Undergraduates and K712 Students in Geological and Environmental Research (Posters)
Pennsylvania Convention Center: Exhibit Hall C
8:00 AM-12:00 PM, Sunday, 22 October 2006

Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 77

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