Upper Coniacian-Lower Campanian biostratigraphy based on the study of calcareous nannofossils from the Austin Group, Texas, USA

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Published: Nov 13, 2012
DOI: https://doi.org/10.22201/igl.05437652e.2012.1.1.135
Keywords:
Calcareous nannofossil, biostratigraphy, upper Cretaceous, Austin Group, Texas

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Patricia Hernández-Bernal
Regional Center for Laboratory Studies, PEMEX Exploration and Production, Southern Region.

Abstract




Fourteen samples from a composite section of the Austin Group in Texas were examined for their calcareous nanofossil content. Fifty-seven upper Cretaceous nannofossil species were recovered and identi ed at least up to generic level. The occurrence of these species was recorded to de ne the position of biozones. Sissingh ́s biozonation scheme for calcareous nannofossils (1977) was used and the samples were dated as upper middle Coniacian to lower Campanian, based on the marker species: Micula decussata (CC 14), Lucianorhabdus cayeuxii (CC 16), Calculites obscurus (CC 17) and Broinsonia cf. B. parca (CC 18).


The results were compared with previous biozonations for calcareous nannofossils, planctonic foraminifera and ammonites, and appear to be consistent for cosmopolitan zonations and regional zonations within Texas, but are not consistent with a regional zonation for Mississippii and Alabama.


These studies will be compared in the next future with studies of samples from Pemex Región Norte, to verify if the Mexican samples are consistent with the formations of the Austin Group in Texas.




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How to Cite
Hernández-Bernal P. (2012). Upper Coniacian-Lower Campanian biostratigraphy based on the study of calcareous nannofossils from the Austin Group, Texas, USA. Paleontología Mexicana, 1(1), 106–120. https://doi.org/10.22201/igl.05437652e.2012.1.1.135
Issue
Vol. 1 No. 1 (2012): Paleontología Mexicana
Section
Palaeozoology
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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