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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. by Geological Survey (U.S.)

    Published: U.S. Geological Survey, 2006
    Description: 46 pages : digital, PDF file.
    “…U.S. Geological Survey open-file report ;…”
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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

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