Fracture patterns and their origin in the Upper Devonian Antrim Shale gas reservoir of the Michigan basin: A review
Robert T. Ryder
Open-File Report 96-23
Figure 2. Correlation chart showing Upper Devonian and adjoining strata in the Michigan basin (from Gutschick and Sandberg, 1991). Closed black circles indicate conodont collections identified by C.A. Sandberg.
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U.S. Department of the Interior, U.S. Geological Survey
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