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.