Ammonoids from the Maastrichtian (Late Cretaceous) at El Zancudo, Nuevo Laredo, Tamaulipas, Mexico
作者： Christina Ifrim , Wolfgang Stinnesbeck
DOI: 10.18268/BSGM2013V65N1A14
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摘要: A small assemblage of Maastrichtian ammonoids was collected at El Zancudo, south Nuevo Laredo, Mexico, on the border with Texas. They are preserved as goethitic internal moulds innermost whorls. Nine taxa described in abbreviated form. Eight have been recorded from northeastern Mexico before: Baculites ovatus, Brahmaites (Anabrahmaites) vishnu (Forbes, 1846), Diplomoceras cylindraceum, Fresvillia sp. indet., Gaudryceras kayei, Hypophylloceras (Neophylloceras) cf. H. (N.) surya, Phyllopachyceras forbesianum, and Tetragonites superstes. The genus Discoscaphites for first time this region. indicates an early late age is compared to other ammonoid assemblages Texas Mexico. It provides important level marker long-distance correlation into deltaic sediments known Difunta Group.
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