Nuevos bivalvos del Eoceno de la Formación Bateque, Baja California Sur, México
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Se reportan 11 nuevos moluscos: bivalvos (Lithophaga sp., Anadara? sp., Gryphaeostrea sanjuanicus sp. nov., Ostrea sp., cf. O. contracta amichel, Argopecten? sp., Chlamys sp. a, Chlamys sp. b, Pecten? sp., Tellina sp., Macrocallista sp. y Pitar sp.), de la Formación Bateque, la cual representa uno de los registros fosilíferos más completos de la época del Eoceno, en Baja California Sur, México. Antes de este trabajo, se revisaron los listados faunísticos ya existentes, dando como resultado 155 especies reportadas de macroinvertebrados para la Formación Bateque. Esta fauna es indicativa de aguas poco profundas (plataforma interna a externa) y de climas tropicales a subtropicales. El conjunto faunístico indica un intervalo de edad del Eoceno temprano (“Piso Capay”) al Eoceno medio superior (“Piso Tejon”). La abundancia y diversidad de los macroinvertebrados previamente reportados, así como los nuevos registros de moluscos, contribuyen en el entendimiento del origen de los diferentes grupos taxonómicos en Baja California Sur y en la costa del Pacífico de Norteamérica. La mayoría de las especies, son indicativas de aguas cálidas relacionadas con la corriente circum-tropical del Tethys, la cual creó las condiciones para un amplio intercambio biótico entre los organismos marinos del Atlántico, el Golfo de México-Caribe y el Pacífico.
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