North American glaciations used to be described in four episodes.However, two of those episode names, the Kansan and Nebraskan, are no longer used.What evidence did scientists use to redefine the glacial history on the North American continent?

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The Answer of North American glaciations used to be described in four episodes.However, two of those episode names, the Kansan and Nebraskan, are no longer used.What evidence did scientists use to redefine the glacial history on the North American continent?

North American Glaciations Used to Be Described in Four Episodes