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This field trip is an excursion to exposures of Pennsylvanian bedrock at Grand Ledge, Michigan, as a backdrop for interdisciplinary examination of the sedimentologic, stratigraphic, and hydrologic research conducted on these important bedrock aquifer units.

The areal extent of Pennsylvanian rocks in the central Lower Peninsula of Michigan is ~28,490 km2. Pleistocene glacial deposits overlie these units throughout the state, but the drift is thin and locally absent along the Grand River Valley, in and around Grand Ledge, Michigan. The geology of the Pennsylvanian deposits is known almost entirely from subsurface research, although sparse outcrops occur near...

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