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Late Mississippian (Chesterian) through Early Pennsylvanian (Atokan) strata, Michigan Basin, USA

Shannon M. Towne, Niah B. H. Venable and David A. Barnes
Late Mississippian (Chesterian) through Early Pennsylvanian (Atokan) strata, Michigan Basin, USA (in Paleozoic stratigraphy and resources of the Michigan Basin, G. Michael Grammer (editor), William B. Harrison (editor) and David A. Barnes (editor))
Special Paper - Geological Society of America (2018) 531: 309-329


The Carboniferous Michigan Basin is the subject of conflicting interpretations resulting from the lack of detailed stratigraphic analysis of relevant rock units. In this study, an approximately 610 m (2000 ft) section of recently acquired core material was evaluated on the basis of lithofacies and stacking patterns, stratigraphic contacts, and well-established regional geologic relations of Mississippian and Pennsylvanian strata. The Bayport formation is composed of seven distinct primary depositional lithofacies reflecting open-marine and shoal-water to restricted peritidal environments, typically capped by an exposure surface. Carbonate-dominated strata of the Bayport formation are interstratified but ultimately transition up section into siliciclastic-dominated strata (previously called the Parma Sandstone) deposited in tidally influenced, estuarine facies. Late Mississippian Bayport strata are sharply overlain by Pennsylvanian-aged siliciclastic lithofacies of the Saginaw Formation. These facies were deposited in a range of terrestrial and marginal-marine environments, from coarse-grained fluvial sandstones at the base (previously known as the Grand River Formation), to the finer-grained channel sandstones and floodplain mudstones of mixed fluvial and estuarine systems in the middle Saginaw Formation. Carbonaceous shales, mudstones, and thin coal intervals characterize the middle to upper Saginaw Formation. In the southern Michigan Basin, an important unconformity at the Mississippian-Pennsylvanian contact is represented by either an incised valley-fill succession or a prominent paleosol above the Bayport formation at the base of the Absaroka section in the Saginaw Formation. In upthrown areas adjacent to a major wrench fault, the Lucas fault in south-central Michigan, the Bayport formation is transitional upward from an intensely karsted limestone to a red-bed paleosol and then to primarily carbonaceous mudrock of the Saginaw Formation. In downthrown areas adjacent to the fault, the formation contact, and systemic unconformity, is a sandstone-on-sandstone contact. Climate-sensitive strata indicate a significant transition from predominantly arid conditions in the Mississippian Bayport formation to humid climate conditions in the Pennsylvanian Saginaw Formation across the Mississippian-Pennsylvanian systemic boundary. Previously, the Bayport formation was considered Meramecian in age; however, palynologic analyses of samples collected from core within the interval indicate a Chesterian (late Mississippian) age, representing a significant revision of existing Michigan Basin stratigraphy.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 531
Title: Late Mississippian (Chesterian) through Early Pennsylvanian (Atokan) strata, Michigan Basin, USA
Title: Paleozoic stratigraphy and resources of the Michigan Basin
Author(s): Towne, Shannon M.Venable, Niah B. H.Barnes, David A.
Author(s): Grammer, G. Michaeleditor
Author(s): Harrison, William B., IIIeditor
Author(s): Barnes, David A.editor
Affiliation: Three Rivers Operating Company, Austin, TX, United States
Affiliation: Oklahoma State Univeristy, Stillwater, OK, United States
Pages: 309-329
Published: 2018
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 9780813725314
References: 55
Accession Number: 2018-088927
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 2 tables, geol. sketch maps
N42°00'00" - N45°00'00", W87°00'00" - W83°00'00"
Secondary Affiliation: Western Michigan University, Colorado State University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 201848
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