Michigan Formation News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Here are photos - old and recent - of the gypsum mine of Grand Rapids, Michigan (recently, a sinkhole developed, revealing a portion of the gypsum mine).

United statesGrand havenGrand rapidsPlaster creekDouglass houghtonGrand rapidMississippian periodMichigan formationGypsum mineFirst mineJackson mineUnknown mine