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Ammonite Biostratigraphy, Lithofacies Variations, And Paleoceanographic Implications For Barremian-Aptian Sequences Of Northeastern Mexico, Ricardo Barragan
Ammonite Biostratigraphy, Lithofacies Variations, And Paleoceanographic Implications For Barremian-Aptian Sequences Of Northeastern Mexico, Ricardo Barragan
FIU Electronic Theses and Dissertations
Two Barremian-Aptian sequences studied in Durango and Nuevo Leon States, northeastern Mexico include three lithic units which have been described as the Cupido Formation of Barremian-early Early Aptian age, its lateral equivalent, the Lower Tamaulipas Formation, and the La Pena Formation extending through the early Albian.
The present work improves the existing ammonite Aptian biozonation by considering constraints associated with a discontinuous spatial and temporal record of the different taxa within the La Pena Formation.
Four ammonite biozones are established: 1) The Dufrenoyia justinae Zone for the late Early Aptian, 2) The Burckhardtites nazasensis/Rhytidoplites robertsi Zone for the middle Aptian, …