First record of ubaghsicystis (Eocrinoidea-echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations

Translated title of the contribution: First record of ubaghsicystis (Eocrinoidea-echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations

Blanca Estela Buitrón Sánchez, Francisco Javier Cuen-Romero*, Matilde Sylvia Beresi, Rogelio Monreal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Introduction: The present work constitutes the first record of Ubaghsicystis Gil-Cid & Domínguez-Alonso (Echinodermata-Eocrinoidea) in the El Gavilán Formation, exposed in the El Sahuaral Hill, a new Cambrian locality of central Sonora, Mexico. The El Gavilán Formation is a sedimentary sequence mainly made up of shale interbedded with limestone, with abundant invertebrate fossils, deposited in an open shelf marine environment. Objective: The main objective of this research work is to describe the species Ubaghsicystis cf. U. segurae for the first time in Mexico, in addition to biostratigraphic and paleoecological considerations. Methods: A composite stratigraphic section of the El Gavilán Fm. was measured in central Sonora, where samples corresponding to eocrinods were collected, the material was examined in the Microscope Leica MZ10. Results: The biotic association is composed of reticulosan sponges, chancelloriids (Chancelloria eros, Allonnia tintinopsis, Archiasterella sp.), hyolithids, brachiopods, trilobites (Quadragnostus depressa, Peronopsis sp., Tonkinella valida, and Elrathina sp.), and echinoderms (Ubaghsicystis cf. U. segurae). Regarding the age, the trilobite association establishes a chronostratigraphic position from the middle Cambrian (Miaolingian, Wuliuan), Altiocculus Subzone, Ehmaniella Zone. The material studied is constituted by isolated echinoderm plates, which probably represent various cycles of theca plates assigned to Ubaghsicystis cf. U. segurae. The genus Ubaghsicystis has been scarcely recorded in a few Cambrian regions (e.g., Burgess Shale in Canada and Los Barrios de Luna in Spain), so that the information about this taxon is limited. Conclusions: The Cambrian succession of Sonora, where Ubaghsicystis occurred, was part of the border from the Laurentia craton during this period, located near the Paleoequator during this period, where ideal conditions for increasing diversity and abundance of species were developed, including echinoderms.

Translated title of the contributionFirst record of ubaghsicystis (Eocrinoidea-echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations
Original languageEnglish
Pages (from-to)51-65
Number of pages15
JournalRevista de Biologia Tropical
Volume69
Issue numbersupp1
DOIs
StatePublished - Mar 2021

Bibliographical note

Funding Information:
The authors are gratefully to Frederick A. Sundberg (Museum of Northern Arizona, USA), who collected the material. The authors thanks the financial support provided by the project PRODEP UNISON-PTC-301: “Paleoecología de los ecosistemas marinos del Cámbrico de Sonora, México: Bioestratigrafía, Paleobiogeografía y su relación con el cratón de Norteamérica”. We also thank the Department of Geology at the University of Sonora, as well as the Instituto de Geología, UNAM, for the support given to carry out this research.

Publisher Copyright:
© 2021, Universidad de Costa Rica. All rights reserved.

Keywords

  • Biostratigraphy
  • Cambrian
  • Eocrinoidea
  • Mexico
  • Paleoecology

Fingerprint

Dive into the research topics of 'First record of ubaghsicystis (Eocrinoidea-echinodermata) from the Cambrian (Miaolingian, Wuliuan) of Sonora, Mexico: Biostratigraphical and paleoecological considerations'. Together they form a unique fingerprint.

Cite this