1. Geologic map of Precambrian rocks, Marenisco, Thayer, and Watersmeet 15-minute quadrangles, Gogebic and Ontonagon counties, Michigan, and Vilas County, Wisconsin Yale Public content 1990. 2002-06-01T04:00:00Z. 2020-10-16T18:49:52Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Michigan, Gogebic County, Ontonagon County, Wisconsin, and Vilas County.