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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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Related references

Longoria J.F., 1977: The Lower Cretaceous-Upper Cretaceous boundary in Mexico based on planktonic foraminifera. Revista - Instituto de Geologia 1(1): 5-9

Young Keith, 1986: The Albian-Cenomanian (Lower Cretaceous-Upper Cretaceous) boundary in Texas and northern Mexico. Journal of Paleontology 60(6): 1212-1219

Young K., 1986: The albian cenomanian lower cretaceous upper cretaceous boundary in texas usa and northern mexico. Journal of Paleontology 60(6): 1212-1219

Lopez Oliva Jose Guadalupe; Keller Gerta; Stinnesbeck Wolfgang, 1998: The Cretaceous-Tertiary boundary in northeastern Mexico; extinction of planktonic Foraminifera. Revista Mexicana de Ciencias Geologicas: , Pages 109-113. 1998.

Weidich K.F., 1984: Microstratigraphy and taxonomy of planktonic foraminifera and paleoecology of the total foraminifera fauna of the limestone alpine deeper upper cretaceous lower cenomanian and lower campanian in the bavarian alps west germany. A microstraticgraphic approach was used to establish 10 foraminiferal zones. The sedimentological and faunal changes associated with the mid-Cretaceous regression are discussed. Approximately 70 spp. are described. Problematic foraminiferal forms...

Lopez-Oliva, J.G.adalupe.; Keller, G..; Stinnesbeck, W.., 1999: The Cretaceous/Tertiary boundary K/T in north east Mexico - extinction of planktonic foraminifera El limite cretacico/Terciario K/T en el noreste de Mexico - extincion de foraminiferos planctonicos. Revista Mexicana de Ciencias Geologicas. 1998( ); 151: 109-113

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Grigelis, A., 1963: A detailed Upper Cretaceous stratigraphic scheme based on the investigation data of Foraminifera and the question of the stratigraphy of the Lower Cretaceous deposits in South Baltic area. Unknown

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Longoria J.F., 1979: Bio stratigraphy of the upper cretaceous based on planktonic foraminifera. A system of Upper Cretaceous planktonic foraminiferal zonation is presented. The Upper Cretaceous is subdivided into 14 foraminiferal zones. When possible, the elaborated zonal scheme is calibrated with the ammonites zonation. The following bounda...