Cave Levels of the Trenton-Black River Formations in Central Southern Michigan
Ronald J. DeHaas, Merlin W. “Casey” Jones, 1988. "Cave Levels of the Trenton-Black River Formations in Central Southern Michigan", The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum, Brain D. Keith
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There are four generalized zones of dissolution in the Trenton-Black River formations in central southern Michigan, which are interpreted as caves formed during karstification. These caves are recognized as lost circulation zones during drilling. The Trenton-Black River caves are compared and contrasted with the Mammoth Cave System of Kentucky.
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The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum
Regional facies for the Upper Ordovician Series (global classification) of eastern North America consist of clean (pure) carbonates, mixed carbonates and terrigenous clastics, shale, terrigenous clastics coarser than shale, and terrigenous clastics prograding over carbonates. The last facies is characteristic of the Upper Ordovician. Maps and cross sections for stages of the Upper Ordovician demonstrate the influence of regional tectonic events on the sedimentation pattern of these facies.