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Late Devonian marine ecosystems of the lower West Falls Group in New York

By
George R. McGhee, Jr.
George R. McGhee, Jr.
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Robert G. Sutton
Robert G. Sutton
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Published:
January 01, 1985

The shallow-water strata of the lower West Falls Group (Upper Devonian) in New York can be subdivided into three units on the basis of extensive black shale tongues from the deep-water Rhinestreet Shale. These units are the “Millport equivalent,” “Beers Hill equivalent,” and “Meads Creek equivalent” in ascending stratigraphic order. Two distinctive community-types developed during lower West Falls deposition: a shallower water spiriferacean-rhynchonellide-bivalve species ensemble, and a deeper water assemblage of unattached epibenthic and sessile semi-infaunal brachiopods. During deposition of the “Beers Hill equivalent,” an additional diverse assemblage—the Nervostrophia-Devonochonetes Community—developed in a unique array of muddy, delta platform environments flanked by seaward, delta front sand bars. The evolution of lower West Falls marine ecosystems represents a complex interaction of biological and physical patterns, of which regional differences in substratum type, and the evolution of those differences through time, played a major role.

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GSA Special Papers

The Catskill Delta

Donald L. Woodrow
Donald L. Woodrow
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William D. Sevon
William D. Sevon
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Geological Society of America
Volume
201
ISBN print:
9780813722016
Publication date:
January 01, 1985

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