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A USGS zonal table for the Upper Cretaceous middle Cenomanian-Maastrichtian of the Western Interior of the United States based on ammonites, inoceramids, and radiometric ages Version 1.0.
Published: U.S. Geological Survey, 2006“…U.S. Geological Survey open-file report ;…”Description: 46 pages : digital, PDF file.
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