The El Cien Formation is a geologic formation in eastern Baja California Sur state, Mexico. UNAM.mx: "The El Cien Formation, Strata of Oligocene and Early Miocene Age in Baja California Sur" ; Revista vol 6, no. 2, 1986; pg 145-162; National Autonomous University of Mexico, Institute of Geology.
Subunits, from younger/higher to older/lower, include the Cerro Colorado Member, San Hilario Member, and Cerro Tierra Blanca Member.
Fossil content 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.
Cetaceans Cetaceans of the El Cien FormationGenusSpeciesLocationStratigraphic positionMaterialNotesImage Calafiacetus C. longipinna Baja California Sur, Mexico A chaeomysticete Echericetus E. novellus Baja California Sur, Mexico A eomysticetid cetacean Kaaucetus K. thesaurus Baja California Sur, Mexico A aetiocetid cetacean Niparajacetus N. palmadentis Baja California Sur, Mexico A aetiocetoid cetacean Tlaxcallicetus T. guaycurae Baja California, Sur, Mexico A chaeomysticete
See also
List of fossiliferous stratigraphic units in Mexico
References