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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Previous workers have synthesized the results of recent deep drilling in the Michigan basin with the concept of Keweenawan rifting. Their model correlates the pre-Mt. Simon clastics in the Sparks et al 1-8 well with those in the State-Beaver Island 1 well, identifies them both as turbidites, and places the pre-Mt. Simon sequence stratigraphically higher in the section than the Jacobsville Formation and Freda Sandstone.
Reexamination of the cores and samples from the Sparks et al 1-8 suggests a lacustrine origin for the pre-Mt. Simon clastics whereas paleomagnetic age data suggest a time equivalence with the Freda Sandstone. The pre-Mt. Simon clastics at Beaver Island are possibly of marine origin and are considered to be time equivalents of the Jacobsville Formation.
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