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GEOREF RECORD

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

Terry Engelder, Rudy Slingerland, Michael A. Arthur, Gary Lash, Daniel Kohl and D. P. Gold
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 (in From the shield to the sea; geological field trips from the 2011 joint meeting of the GSA Northeastern and North-Central Sections, Richard M. Ruffolo (editor) and Charles N. Ciampaglio (editor))
Field Guide (Geological Society of America) (March 2011) 20: 17-44

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 J (sub 2) 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.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 20
Title: 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
Title: From the shield to the sea; geological field trips from the 2011 joint meeting of the GSA Northeastern and North-Central Sections
Author(s): Engelder, TerrySlingerland, RudyArthur, Michael A.Lash, GaryKohl, DanielGold, D. P.
Author(s): Ruffolo, Richard M.editor
Author(s): Ciampaglio, Charles N.editor
Affiliation: Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Affiliation: GAI Consultants, Homestead, PA, United States
Pages: 17-44
Published: 201103
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
ISBN: 978-0-8137-0020-5
References: 46
Accession Number: 2011-046237
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. cols., 7 tables, geol. sketch maps
N40°15'00" - N41°34'60", W78°37'60" - W76°25'00"
Secondary Affiliation: Wright State University-Lake Campus, USA, United StatesState University of New York at Fredonia, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201126
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