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An introduction to structures and stratigraphy in the proximal portion of the Middle Devonian Marcellus and Burket/Geneseo black shales in the Central Appalachian Valley and Ridge

By
Terry Engelder
Terry Engelder
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Rudy Slingerland
Rudy Slingerland
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Michael Arthur
Michael Arthur
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Gary Lash
Gary Lash
Department of Geosciences, SUNY Fredonia, Fredonia, New York 14063, USA
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Daniel Kohl
Daniel Kohl
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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D.P. Gold
D.P. Gold
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Published:
January 01, 2011

Abstract

A Marcellus-Burket/Geneseo field trip in the Appalachian Valley and Ridge features both brittle and ductile structures. The degree to which these structures have developed depends on both lithology, which is a function of the stratigraphic architecture of the Devonian Appalachian Basin and position relative to the foreland during the Alleghanian Orogeny. Joints are best developed in the black shales and the units immediately above with the J2 joint set most prominent in the Brallier Formation just above the Burket/Geneseo Formation. Faults are seen in the form of cleavage duplexes and bedding-parallel slip accompanying flexural-slip folding. Cleavage duplexes are found in the Marcellus whereas bedding-parallel slip is more common in the overlying Mahantango Formation and further up the section in the Brallier Formation. Layer-parallel shortening decreases from greater than 50% to approximately 10% when crossing the Jacks Mountain–Berwick Anticline structural front from the hinterland portion to the foreland portion of the Valley and Ridge. Disjunctive cleavage, the primary mechanism for layer-parallel shortening, is best developed in carbonates whereas pencil cleavage is best developed in shales.

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GSA Field Guide

From the Shield to the Sea

Richard M. Ruffolo
Richard M. Ruffolo
GAI Consultants, Inc. Pittsburgh Office 385 East Waterfront Drive Homestead, Pennsylvania 15120-5005 USA
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Charles N. Ciampaglio
Charles N. Ciampaglio
Wright State Universityâ?"Lake Campus 7600 Lake Campus Drive Celina, Ohio 45822 USA
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Geological Society of America
Volume
20
ISBN electronic:
9780813756202
Publication date:
January 01, 2011

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