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The Bajocian (Jurassic) ammonite fauna of Oaxaca, Mexico

Published online by Cambridge University Press:  14 July 2015

Jose Sandoval  and
Gerd E. G. Westermann
Jose Sandoval
Affiliation:
Department of Geology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
Gerd E. G. Westermann
Affiliation:
Department of Geology, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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Abstract

The marine Bajocian Taberna Formation of west-central Oaxaca consists mainly of shale, intercalated siltstone, and frequent iron concretions with ammonites. This formation overlies the continental Zorrillo Formation and is overlain by the continental to subcontinental Simon and Otatera formations. The best outcrops are in the area of Mixtepec and Diquiyú-Yutatio.

Two new ammonite biozones are distinguished: Duashnoceras floresi Range Zone (≃ upper Humphriesianum-lower Subfurcatum standard zones), and Parastrenoceras zapotecum Assemblage Zone (≃ Subfurcatum Standard Zone). The biogeographic affinities are principally with the Mediterranean Province, and also with both the East-Pacific Andean and North Cordilleran provinces. A high percentage of species is endemic. The Stephanoceratinae, mainly Duashnoceras, are dominant in the D. floresi Zone, which also includes Subcollina lucretia, Strigoceras (Liroxyites), Stephanoceras, Phaulostephanus, Stephanosphinctes, and Oppelia. Parastrenoceras and Leptosphinctes are dominant in the P. zapotecum Zone, whereas Oppelia and Strigoceras are less abundant.

Stephanosphinctes n. gen., type species S. buitroni n. sp., is intermediate between the Stephanoceratinae and Leptosphinctinae. The species Phaulostephanus burckhardti is also new.

Type
Research Article
Information
Journal of Paleontology , Volume 60 , Issue 6 , November 1986 , pp. 1220 - 1271
Copyright
Copyright © The Paleontological Society 

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