Subject: Silurian Geologic Period / Spatial Coverage: Michigan Basin (Mich. and Ont.) / Temporal Coverage: Ordovician - Yale University Library GeoBlacklight Search Results

Start Over Subject Silurian Geologic Period Spatial Coverage Michigan Basin (Mich. and Ont.) Temporal Coverage Ordovician

1. Thickness and lithology of Upper Ordovician and Lower and Middle Silurian rocks in the Michigan Basin

1948. 2018-01-30T14:30:37Z. 2018-01-30T14:30:37Z. Cohee, George Vincent, 1907-. U.S. Geological Survey. English. cartographic image. Public. Michigan Basin (Mich. and Ont.), North America, and Michigan Basin. Ordovician, Silurian, and From 405 to 500 million years ago.