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Records of the ammonites Sphenodiscus lobatus and Sphenodiscus pleurisepta from the latest Cretaceous Gulf of Mexico region, the Western Interior Seaway and the Atlantic coast have repeatedly been used as a stratigraphic index for a Maastrichtian age. In recent years, however, high-resolution biostratigraphy on north-eastern Mexican occurrences and its combination with other correlation tools, such...
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