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Michigan sinkholes

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karst - Michigan State University

An interpretive nature trail that visits the rims of these sinkholes and other karst and natural features of interest is ... Michigan Karst Conservancy, 2805 ...
http://www.geo.msu.edu/extra/geogmich/NE-MIkarst.html

Sinkhole - Michigan State University

Overview. Sinkholes are depressions in the landscape caused by the dissolution and collapse of subsurface limestone, dolomite, or gypsum. The term karst, first ...
http://mnfi.anr.msu.edu/communities/community.cfm?id=10707