Subject: Ordovician Geologic Period / Temporal Coverage: From 425 to 570 million years ago / Year: 1945 - Yale University Library GeoBlacklight Search Results

Start Over Subject Ordovician Geologic Period Temporal Coverage From 425 to 570 million years ago Year 1945

1. Sections and maps of Lower Ordovician and Cambrian rocks in the Michigan Basin, Michigan and adjoining areas

1945. 2018-02-20T15:02:08Z. 2018-02-20T15:02:08Z. Cohee, George Vincent, 1907-. U.S. Geological Survey. English. cartographic image. Public. Michigan Basin (Mich. and Ont.), North America, and Michigan Basin. Ordovician, Cambrian, and From 425 to 570 million years ago.