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The lower cretaceous upper cretaceous boundary in mexico based on planktonic foraminifera


, : The lower cretaceous upper cretaceous boundary in mexico based on planktonic foraminifera. Universidad Nacional Autonoma de Mexico Instituto de Geologia Revista (1): 5-9

The Lower Cretaceous/Upper Cretaceous boundary in Mexico is established at the base of the Thalmanninella ticinensis/T. evoluta Interval-Zone, corresponding to the Zone with Stoliczkaia dispar of the ammonite scheme of zonation. The Vraconian is regarded as a valid stage and represents the time comprised by the zone with S. dispar. In Mexico the Lower Cretaceous/Upper Cretaceous boundary lies within the Cuesta del Cura limestone.

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