Digital bedrock geologic map of the Ashland and northern part of the Ironwood 30' x 60' quadrangles, Wisconsin and Michigan

Online link http://pubs.usgs.gov/of/1999/of99-546/
Description Geologic units and structural features, GIS data files
Originators Cannon, William F.; Woodruff, Laurel G.; Nicholson, Suzanne W.; Hedgman, Cheryl A.; and Barber-Delach, Robert D.
Publication U.S. Geological Survey Open-File Report 99-546

States or counties

Geologic units and structural features (reduced size image)
Geologic units and structural features (reduced size image)
Additional images
Overview map showing quadrangle names and county boundaries
https://pubs.usgs.gov/of/1999/of99-546/overview.jpg