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The Maastrichtian ammonites Coahuilites sheltoni Böse, 1928, and Sphenodiscus pleurisepta (Conrad, 1857), from the uppermost Pierre shale and basal Fox Hills formation of Colorado and Wyoming

Author: Kennedy, W. J. (William James) - Landman, Neil H. - Cobban, William Aubrey,

Publisher: New York NY,American Museum of Natural History 1996

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