Resumen del producto

Four genera of spatangoid echinoids (Agassizia, Pericosmus?, Asterostoma and Eupatagus) are reported and a new form of spine (Order Cidaroida?) that were found in Tepetate and Bateque Formations in Baja California Sur, Mexico. These formations are important in the geological record, especially in the North American Pacific region, as they may represent one of the fossil records and paleoceanographic most complete Paleogene period. The Tepetate Formation is between 70 and 150 km eastnortheast of the city of La Paz, while the Bateque Formation is located on the eastern and western of Cuenca Laguna San Ignacio to Arroyo Mezquital (between San Juanico and La Purísima). Previous studies, prove that the marine invertebrates found in the middle part of the Tepetate Formation match those present in the middle part of the Bateque Formation, this proves that both formations are equivalent in time and correspond to the “Capay Stage” (Early Eocene: Ypresian). The specimens found in this study are representative of the “Capay Stage” and are typical internal to external platform environments. These echinoderms have their origin in the warm waters of the Indo-Pacific region, and are believed to have been carried by the Tethys circumglobal current to the American continent.

Palabras clave: Baja California Sur; Echinoderms; Tepetate; Bateque; Eocene; spatangoid

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