Type Geologic formation Primary Marine limestones Country Southwestern Mexico | Overlies Santiago Formation Region Chiapas | |
The Sierra Madre Formation is a geologic formation in Chiapas state, southern Mexico.
It includes marine limestones.
Fossil record
The formation preserves fossils dating back to the Cretaceous period. Pepemkay, a Late Cretaceous prehistoric ray-finned fish, were found in the formation. Other prehistoric fish fossils, found in quarries near the Municipality of Ocozocoautla de Espinosa, include Macrosemiids (Macrosemiocotzus species), Clupeomorphs (Triplomystus applegatei and Paraclupea-like species), and Alepisauriformes (Saurorhamphus and Enchodus species)
References
Sierra Madre Formation Wikipedia(Text) CC BY-SA