El Cien Formation

The El Cien Formation is a geologic formation in eastern Baja California Sur state, Mexico.

[1] Subunits, from younger/higher to older/lower, include the Cerro Colorado Member, San Hilario Member, and Cerro Tierra Blanca Member.

[1] It preserves fossils dating back to the Oligocene epoch of the Paleogene period and Early Miocene epoch of the Neogene period, during the Cenozoic Era.

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