It preserves fossils dating back to the Kimmeridgian to lowermost Berriasian.

[1][2] It is laterally equivalent to the La Caja Formation[3] and the Pimienta Formation.

The ichthyosaurs Jabalisaurus[4] and Acuetzpalin are known from the formation,[5] as well as the metriorhynchid Dakosaurus[6] and indeterminate pliosaurs.

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