Auto-generated ArcGIS service - Geologic Resources Inventory Digital Geologic-GIS Map of Isle Royale National Park and Vicinity, Michigan. GIS Data: ArcGIS 10.x ArcMap document (.mxd) file. Relative paths set to data in 10.x file geodatabase isro_geology.gdb within the same folder as this .mxd file. Reference scale set to 1:62,500 scale.659236

Source: Digital Geologic-GIS Map of Isle Royale National Park and Vicinity, Michigan (NPS, GRD, GRI, ISRO, ISRO digital map) adapted from a U.S. Geological Survey Miscellaneous Geologic Investigations Map by Huber (1973), Professional Paper map by Wolff and Huber (1973), and a 7.5' Topographic Quadrangles map (1996)