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A reevaluation of the Burnt Bluff Group (Llandovery, Silurian, Michigan Basin) from subsurface and outcrop data: Development of a time-transgressive depositional model

By
P.J. Voice
P.J. Voice
Department of Geosciences, Western Michigan University, 1903 W. Michigan Avenue, Kalamazoo, Michigan 49008-5421, USA, and Michigan Geological Repository for Research and Education, Michigan Geological Survey, Western Michigan University, Kalamazoo, Michigan 49008-5241, USA
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W.B. Harrison, III
W.B. Harrison, III
Michigan Geological Repository for Research and Education, Michigan Geological Survey, Western Michigan University, 1903 W. Michigan Avenue, Kalamazoo, Michigan 49008-5241, USA
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G.M. Grammer
G.M. Grammer
Boone Pickens School of Geology, Oklahoma State University, 105 Noble Research Center, Stillwater, Oklahoma 74078-3031, USA
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Published:
May 10, 2018
Publication history
09 June 201720 February 2018

ABSTRACT

Previous work shows that the Burnt Bluff Group was deposited as a series of shallow- to moderate-water-depth facies in a tropical marine setting in the Michigan Basin during the Llandoverian. New interest in the unit for both hydrocarbon resources (subsurface) and aggregate resources (outcrop) is driving research in this poorly understood unit. New cores, as well as investigation of the outcrop belt in the Upper Peninsula of Michigan, allow further elaboration of the depositional model. The traditional interpretation of the Burnt Bluff Group consists, in stratigraphic order, of the open-marine deposits of the Lime Island Formation, the restricted lagoonal–tidal flat Byron Formation, and the open-marine deposits of the Hendricks Formation. The contacts with the underlying Cataract Group and overlying Manistique Group are gradational. Identification and description of facies in both cores and outcrop sections provide new constraints on the stratigraphic nomenclature of the Burnt Bluff Group. New outcrop and core data require the revision of the depositional model for portions of the group because typical Byron-like facies are found interbedded with Hendricks-like facies in both the Byron and Hendricks Formations. Limited age data from published research combined with the new facies model for the Burnt Bluff Group suggest that the unit was deposited as a time-transgressive package on a carbonate ramp during the Llandoverian.

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Contents

GSA Special Papers

Paleozoic Stratigraphy and Resources of the Michigan Basin

G. Michael Grammer
G. Michael Grammer
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William B. Harrison, III
William B. Harrison, III
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David A. Barnes
David A. Barnes
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Geological Society of America
Volume
531
ISBN electronic:
9780813795317
Publication date:
May 10, 2018

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