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| Format: | Artículo científico |
| Language: | en |
| Published: |
Sociedad Geológica Mexicana, A.C.
2020
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| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=94366150005 https://www.redalyc.org/journal/943/94366150005/ https://www.redalyc.org/journal/943/94366150005/html/ https://www.redalyc.org/journal/943/94366150005/94366150005.epub https://www.redalyc.org/journal/943/94366150005/movil |
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Table of Contents:
- Columnar ossicles of Permian crinoids, including two new genera, from the Grupera Formation (Asselian-Sakmarian) of Chiapas, Mexico Miguel A. Torres-Martínez Rafael Villanueva-Olea Francisco Sour-Tovar Ciencias de la Tierra Parataxa Cyclogrupera Floricyclocion Grandian Province Asselian‒ Sakmarian Eleven morphotypes of columnar ossicles of Permian crinoids collected from the Grupera Formation (Asselian‒Sakmarian) are described. Floricyclocion heteromorpha and Cyclo-grupera minor are proposed as new morphogenera and morphospecies. Preserved elements allow relating the depositional paleoenvironment to restricted waters of the inner ramp. The stratigraphical range of Cyclo-caudiculus regularis, Heterostelechus keithi, Lamprosterigma erathense and Cyclocaudex insaturatus is extended from the Pennsylvanian (Upper Carboniferous) to the lower Cisuralian (lower Permian). The record of all parataxa studied is the first in Chiapas, Mexico, and the first formal work on Permian crinoids from the Chicomuselo region. Because the specimens were found in a Permian unit that had been related to the Grandian Province of North America (Texas and New Mexico in USA; Coahuila, Sonora and Chiapas in Mexico; and Palmarito in Venezuela), it is suggested that crinoids should be part of the same paleoprovince. 2020 artículo científico 1405-3322 https://www.redalyc.org/articulo.oa?id=94366150005 https://www.redalyc.org/journal/943/94366150005/ https://www.redalyc.org/journal/943/94366150005/html/ https://www.redalyc.org/journal/943/94366150005/94366150005.epub https://www.redalyc.org/journal/943/94366150005/movil 10.18268/BSGM2020v72n2a280819 en http://www.redalyc.org/revista.oa?id=943 Boletín de la Sociedad Geológica Mexicana application/pdf Sociedad Geológica Mexicana, A.C. Boletín de la Sociedad Geológica Mexicana (México) Num.2 Vol.72