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

BUITRÓN SÁNCHEZ, B.E; CUEN-ROMERO, F.J.; BERESI, MATILDE SYLVIA; MONREAL, R.

Revista de Biología Tropical,

(SIEDIN), Universidad de Costa Rica, San José, Costa Rica.

Lugar: SAN JOSÉ; Año: 2021 vol. 69 i p. 51 - 61

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. 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.