Great Lakes Region Geological Highway Map
This colorful, educational map presents state/regional surface rock outcrop information - age, depositional environment, rock type, and names of formations. Map includes major highways, towns, and landmarks. Printed on a single sheet and folded to glove compartment size, each has a stratigraphic column by state, mileage charts, and may depict spots of interest.Scale: 1 inch = 30 miles
Maps and Mapping
States included are Illinois, Indiana, Michigan, Ohio, and Wisconsin.
December 31, 1978
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