Bedrock Geology of Wisconsin, Northeast Sheet Types of bedrock, formation names, major faults, and time period of formation. Bedrock Geology Precambrian Bedrock Data and Resources M082 Bedrock Geology of Wisconsin, Northeast Sheet Greenberg, J.K.; Brown, B.A.; 1984 Map: Scale 1:250,000, 28 in x 37 in Download ZIP M082-dataset01 M082 Dataset 1: GIS Data Greenberg, J.K.; Brown, B.A.; 1984 GIS Data: GeMS file geodatabase and metadata Download Related Collections Map View Map