Geological Map of parts of Minnesota and Wisconsin designed to show Portions of the ROck Formations now conealed by Drift.
An early hand colored geological map of eastern Minnesota and western Wisconsin. Spans from Galena Illinois in the south and reaches up through the Mississippi River, its headwaters and tributaries. Shows six different geologic formations from the boundary waters of Minnesota south to these neighboring states. Notes a few forts and place names.
Condition is good though sheet has some marginal dampstaining. Image size is approximately 10.25 x 8 (inches)