Mississippian crinoids from the El Bísani region, northwestern Sonora State, Mexico
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Abstract
Lithologically the Represo Formation consists of mainly dolomitic limestone with a high content of fragments from stem and articulate plates of crinoids of very small size that conformed encrinites. The four species of crinoids from Sonora were previously described in the United States of America and correspond to Goniocion turgidus Moore and Jeffords 1968, of the early Mississippian Iowa, Flucticharax undatus Moore and Jeffords 1968, Euloncherostigma impunitum Moore and Jeffords 1968 identified of early Kentucky and Pentagonomischus plebeius Moore and Jeffords 1968 late Mississippian Illinois.
The outcrops contain abundant and diverse marine invertebratefossils among them, foraminifers, ostracods, conodonts, corals bryozoans, brachiopods, crinoids, pelecypods and gastropods.
In this study were identified four species of crinoids that correspond to Goniocion turgidus Moore and Jeffords 1968, Flucticharax undatus Moore and Jeffords 1968, Euloncherostigma inpuditum Moore and Jeffords 1968 referred to the late Mississippian of Iowa, USA, and Pentagonomischus plebeius Moore and Jeffords 1968 referred to the late Mississippian of Kentucky, USA.
Based on the composition of the biotic community, it is inferred that the depositional environment was in a carbonate platform of shallow, well oxygenated tropical seas, this kind of environments prevailing during the Mississippian in the Caborca-Bisani region.
Distribution analysis of the crinoids species and associated fauna of northwestern Sonora region, allowed to relationships it with Mississippian fauna (Osagean) of Iowa, Illinoids and Kentucky, USA, localities that belong to the North American Craton Province.
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