Subject: Paleozoic Geologic Period / Spatial Coverage: Middle West. - Yale University Library GeoBlacklight Search Results

Start Over Subject Paleozoic Geologic Period Spatial Coverage Middle West.

1. Maps showing areal extent of selected Paleozoic shales in the northern midcontinent, U.S.A.

1992. 2002-06-01T04:00:00Z. 2016-05-17T16:22:16Z. Geological Survey (U.S.). U.S. Geological Survey ; For sale by Map Distribution. English. cartographic image. Public. Middle West and Middle West. Paleozoic and From 230 to 570 million years ago.

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1. Maps showing areal extent of selected Paleozoic shales in the northern midcontinent, U.S.A.

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