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AAPG Bulletin

Abstract

(Begin page 325)

AAPG Bulletin, V. 85, No. 2 (February 2001), P. 325-357.

Copyright ©2001. The American Association of Petroleum Geologists. All rights reserved.

Tectonic and eustatic signals in the sequence stratigraphy of the Upper Devonian Canadaway Group, New York state

Gerald J. Smith,1 Robert D. Jacobi2

1Department of Geology, 876 Natural Science Complex, SUNY at Buffalo, Amherst, New York, 14260; email: [email protected]
2Department of Geology, 876 Natural Science Complex, SUNY at Buffalo, Amherst, New York, 14260; email: [email protected]

AUTHORS

Gerald Smith has a B.A. degree and Ph.D. in geology from the University of Buffalo, SUNY. He has served as shipboard sedimentologist on the Ocean Drilling Program Leg 181 Southwest Pacific Gateway study. Currently he is conducting postdoctoral research in a three-year appointment as research associate professor to the Geology Department at the University of Buffalo. His current research focuses on analysis of syndepositional faults in foreland basins, clastic sedimentology/stratigraphy, and environmental controls on trace fossils.

Robert Jacobi received his B.A. degree from Beloit College and his Ph.D. from Columbia University. His present research topics include clastic sedimentology and stratigraphy, characterization of fractures, and identification of subtle faults based on an integration of remote sensing lineaments, geophysical anomalies, structure, subsurface and outcrop sedimentology, and stratigraphy. He has been major thesis advisor for more than 30 graduate students. He is president of SEPM, Eastern Section and past chair of Geological Society of America, Northeastern Section.

ACKNOWLEDGMENTS

We thank numerous field assistants for their help during five field seasons. Reviews by Greg Baker, John Harper, Randi Martinsen, Charles Ver Straeten, Neil Hurley, and Jory Pacht considerably improved earlier versions of the manuscript. Partial support for this research was provided by NYSERDA contract #1782-LLRW-92, EDMAP grants #1434-HQ-96-AG-01550 and #1434-HQ-97-AG-01789, and STATEMAP grant #C-005647.

ABSTRACT

We have refined the late Frasnian to early Famennian relative sea level curve based on detailed stratigraphic data from more than 1200 outcrops in the Appalachian basin of western New York. This curve is constructed from considerations of lithologies, bedforms, and ichnofacies. We document 3 sequences and 48 parasequences in the Canadaway Group, part of the marine component of the Catskill delta complex. Several apparent lowstands and one transgression are localized along the syndepositionally active Clarendon-Linden fault system; we infer that these systems tracts are forced, and result from interaction between fault-block motion and eustatic sea level changes. This detailed study thus demonstrates that sea level curves inferred from local foreland basins may have a stronger tectonic signal than formerly perceived.

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