Journal article

Uppermost lower aptian transgressive records in mexico and spain: chronostratigraphic implications for the Tethyan sequences

  • Moreno-Bedmar, Josep A. Instituto de Geología, Universidad Nacional Autónoma de México, Mexico
  • Bover-Arnal, Telm Département de Géosciences, Université de Fribourg, Switzerland
  • Barragán, Ricardo Instituto de Geología, Universidad Nacional Autónoma de México, Mexico
  • Salas, Ramon Departament de Geoquímica, Petrologia i Prospecció Geològica, Facultat de Geologia, Universitat de Barcelona, Spain
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  • Terra Nova. - 2012, vol. 24, no. 4, p. 333–338
English A widespread marine transgression, which began at the very end of the Early Aptian, is well recorded in Mexico and Spain. In Mexico, this transgression was the most important Aptian transgressive event and its record begins in the Dufrenoyia justinae Zone, whereas in Spain the corresponding transgression is registered in the uppermost part of the Dufrenoyia furcata Zone. The basal age of this Tethyan transgression does not correspond exactly to any of the Lower Aptian third-order sequences as reported in the literature. In Spain, the most important Aptian transgressive event was earlier, corresponding to the Tethyan sequence Ap3, which is well-defined below this transgression reported herein. Consequently, it is possible to correlate this later transgressive event with the third-order Ap4 sequence, which has commonly been attributed to the Upper Aptian. The available ammonoid data allow us to correct the basal age of the transgression, and to correlate the start of the ammonite record in Mexico with the Tethyan sequence Ap4.
Faculté des sciences et de médecine
Département de Géosciences
  • English
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