Middle Jurassic Lithostratigraphy of the Tecocoyunca Group in the Numí Riber Area (Close To Tlaxiaco), Oaxaca

Authors

  • Raúl Sabino Carrasco-Ramírez

mexico, oaxaca, middle jurassic, tecocoyunca group, lithostratigraphy, paleontology

Abstract

The Jurassic lithostratigraphy of the Mixtec Region is relatively well known, however the system on which is based includes formational descriptions somewhat deficient (e.g. vagueness, characterization by fossil content, insufficient cartographic discrimination). In order to contribute to correct such deficiency, we undertook a detailed study of the Río Ñumí Area, vicinity of Tlaxiaco, where the Middle Jurassic units that make up the Tecocoyunca Group display their attributes, thus allowing to supplement the formational descriptions. It was found that locally, the Tecocoyunca Group includes in the lower part the associated Formations Zorrillo/Taberna (Early to Late Bajocian), consisting of ~287m of carbonaceous siltstone, mudstone and subarkosic very fine-grained sandstone and siltstone; this composite unit bears pelecypods and continental plants, as well as two carbon zones; it is interpreted that they were part of a delta complex. These associated formations conformably underlie the Simón Formation (Middle-Late Bathonian), it consists of ~270m of subarkoses and siltstone set in thin to thick strata; it is interpreted as a transitional deposit.

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Middle Jurassic Lithostratigraphy of the Tecocoyunca Group in the Numí Riber Area (Close To Tlaxiaco), Oaxaca. (2023). Global Journal of Science Frontier Research, 23(C1), 27-42. https://journalofscience.org/index.php/GJSFR/article/view/102631

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Middle Jurassic Lithostratigraphy of the Tecocoyunca Group in the Numí Riber Area (Close To Tlaxiaco), Oaxaca

Published

2023-05-02

How to Cite

Middle Jurassic Lithostratigraphy of the Tecocoyunca Group in the Numí Riber Area (Close To Tlaxiaco), Oaxaca. (2023). Global Journal of Science Frontier Research, 23(C1), 27-42. https://journalofscience.org/index.php/GJSFR/article/view/102631