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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Cantu-Chupa, A.,
DOI:10.1306/13191084M902804
2009 by The American Association of Petroleum Geologists.
Ammonites of the Cretaceous Taraises and lower Tamaulipas formations in eastern Mexico
Abelardo Cantu-Chapa
Instituto Politecnico Nacional, Mexico, D.F., Mexico
ACKNOWLEDGMENTS
The author was generously assisted by N. Monroy Ayala, M. A. Gomez Galindo, J. Morales Marin, and R. Orozco Charles in the research of the Tampico oil well regions. The author thanks H. Amezcua for the assistance with photography. I express my gratitude to J. Klein and Robert Scott for providing constructive reviews of the manuscript. My special thanks to J. Klein for helping with the bibliographic research. I am grateful to Claudio Bartolini for the translation of the manuscript.
ABSTRACT
The Taraises and lower Tamaulipas formations of the Early Cretaceous (Berriasian–Valanginian) are basinal sedimentary sequences in northeastern and eastern Mexico, respectively. The first unit was penetrated in the San Javier 1 and 2 wells at depths between 1800 and 3200 m (5905 and 10,499 ft), and the second was drilled in the Bejuco 6 and the La Laja 8 wells between 2000 and 2500 m (6562 and 8202 ft). In the Bejuco 6 well, the lower Tamaulipas Formation represents a condensed section. Geophysical logs and ammonites allow the characterization and age dating of these units.
Two important ammonite groups (Ancyloceratoidea and Perisphinctoidea) are described from cores in the four wells and from surface occurrences. Four new genera are proposed, Misantlites, Wiedmannites, Parvaites, and Parrasites; new species are M. reyesi, Aegocrioceras eguiluzi, Capeloites lajense, C. peyroullesense, Thurmanniceras kleini, Neohoploceras bartolinii, Parvaites aguirrei, P. leanzai; and one new subfamily is proposed, Capeloitinae.
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