Rafael Villanueva-Olea, Sara A. Quiroz-Barroso, Jesús Quiroz-Barragán, Miguel A. Torres-Martínez, Francisco Sour-Tovar
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引用次数: 3
Abstract
Thirteen parataxa of crinoid plates from two localities of the lower-middle Permian of the Las Delicias Formation are described. Both zones are situated in Sierra de las Delicias, to southwestern Coahuila state. The parataxa Pentagonopternix coahuilensis n. sp., Cyclocaudex typicus, C. insaturatus, C. cf. insaturatus, Cyclocaudex sp., Floricyclus diminuta n. sp., Floricyclus sp. Preptopremnum rugosum, P. laeve, Preptopremnum sp., Heterostelechus keithi, Cyclocaudiculus regularis and Epicrinus torreonense new genus and species were found in Las Difuntas locality of the middle Permian (Wordian–Capitanian) whereas Cyclocaudex typicus, C. sp., Preptopremnum laeve and Epicrinus torreonense were also found in Las Sardinas locality whose strata have been dated as early Permian (Kungurian-Roadian). The occurrence of all parataxa in strata from the middle Permian of the Las Delicias Formation allowed extending their stratigraphic range until the Wordian–Capitanian. Most species described have been associated to the Grandian Paleoprovince, nonetheless, the presence of Floricyclus and Pentagonopternix parataxa in the Permian of Coahuila proves the cosmopolitan nature of both genera.
期刊介绍:
The Boletín de la Sociedad Geológica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earth’s crust. Geology has no boundaries so we may publish papers on any area of knowledge that is interesting to our readers.
We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. Furthermore, the Boletín has been published since 1904; that makes it one of the oldest scientific journals currently active in Mexico and, most notably, its entire contents, from the first issue on, are available online.