Tlayúa Formation

Tlayúa Formation Stratigraphic range: Albian
Type	Geological formation
Location
Region	Puebla
Country	Mexico

The Tlayúa Formation is an Early Cretaceous (late Albian) geological formation near Tepexi de Rodríguez, Puebla.^[1]

Paleobiota

The formation contains a diverse array of vertebrate and invertebrate fossils. About 70% of the macrofossils are osteichthyan fish.^[2] Other vertebrates include chelonians, pterosaurs, lepidosaurs, and crocodiles.^[3] Cyanobacteria, foraminifera, algae, gymnosperms, sponges, cnidarians, annelids, gastropods, ammonites, bivalves, arachnids, insects, isopods, anomurans, brachyurans, crinoids, echinoids, holothuroids, stelleroids, and ophiuroids, have also been recovered from the Tlayúa Formation.^[3]

Lepidosaurs

Genus	Species	Abundance	Notes
Huehuecuetzpalli	H. mixtecus		A possible basal iguanian
Pamizinsaurus	P. tlayuaensis		An osteoderm-covered sphenodontian
Ankylosphenodon[4]	A. pachyostosus		An aquatic sphenodontian
Tepexisaurus[5]	T. tepexii		A basal scincomorph

References

1. Applegate, S. (1988). "A new genus and species of a holostean belonging to the family Ophiopsidae, Teoichthys kallistos, from the Cretaceous, near Tepexi de Rodriguez, Puebla" (PDF). Revista mexicana de ciencias geológicas 7 (2): 200–205.
2. Alvarado-Ortega J, González-Rodríguez KA, Blaco-Piñón A, Espinosa-Arrubarrena L, Ovalles-Damián E (2006). "Mesozoic Osteichthyans of Mexico". In Vega, FJ; TG Nyborg, MC Perrilliat, M. Montellano-Ballesteros, SRS Cevallos-Ferriz. Studies on Mexican Paleontology, Topics on Geobiology 24. Dordrecht, Netherlands: Springer Verlag. pp. 169–207. ISBN 1402039859.
3. Vega, F. J., Bruce, N. L., Serrano, L., Bishop, G. A., & Perrilliat, M. D. C. (2005). "A review of the Lower Cretaceous (Tlayúa Formation: Albian) Crustacea from Tepexi de Rodríguez, Puebla, Central Mexico" (PDF). Bulletin of the Mizunami Fossil Museum (32): 25–30.
4. An Unusual Aquatic Sphenodontian (Reptilia: Diapsida) from the Tlayua Formation (Albian), Central Mexico V. H. Reynoso Journal of Paleontology Vol. 74, No. 1 (Jan., 2000), pp. 133-148
5. Vega, Francisco J.; Nyborg, Torrey G.; María del Carmen Perrilliat; Marisol Montellano-Ballesteros; Sergio R.S Cevallos-Ferriz; Sara A. Quiroz-Barroso (2006). "Research on Fossil Amphibians and Reptiles". In Landman, Neil H. Studies on Mexican Paleontology 24. Douglas S. Jones. Dordrecht, Netherlands: Springer. p. 214. ISBN 1-4020-3882-8. Retrieved 31 May 2011.

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Cretaceous Period Lower/Early Cretaceous Upper/Late Cretaceous Berriasian | Valanginian | Hauterivian Barremian| Aptian | Albian Cenomanian | Turonian | Coniacian Santonian |Campanian | Maastrichtian

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