1980. 2002-06-01T04:00:00Z. 2023-01-06T04:04:24Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Alaska and Alaska. Paleozoic, Devonian, Mississippian, and From 230 to 570 million years ago.
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1982. 2002-06-01T04:00:00Z. 2023-06-10T03:01:22Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Montana. Mississippian.
1946. 2018-01-23T14:42:00Z. 2018-01-23T14:42:00Z. De Witt, Wallace, Jr., 1920-2012. U.S. Geological Survey. English. cartographic image. Public. Pennsylvania, Ohio, Ohio., and Pennsylvania. Mississippian and From 310 to 345 million years ago.