1. Geologic map of the Keweenaw Peninsula and adjacent area, Michigan [cartographic material] Yale Public content 2001. 2002-06-01T04:00:00Z. 2016-07-21T21:15:56Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. cartographic image. Public. Michigan, Keweenaw Peninsula, and Keweenaw Peninsula.