The Tlayúa Formation is an Early Cretaceous

Early Cretaceous

The Early Cretaceous or the Lower Cretaceous , is the earlier or lower of the two major divisions of the Cretaceous...

 (late Albian

Albian

The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous epoch/series. Its approximate time range is 112.0 ± 1.0 Ma to 99.6 ± 0.9 Ma...

) geological formation near Tepexi de Rodríguez

Tepexi de Rodríguez (municipality)

Tepexi de Rodríguez is a town and municipality in Puebla in south-eastern Mexico.-References:...

, Puebla

Puebla

Puebla officially Estado Libre y Soberano de Puebla is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 217 municipalities and its capital city is Puebla....

, Central Mexico.

Lepidosaurs

Genus	Species	Abundance	Notes
Huehuecuetzpalli Huehuecuetzpalli Huehuecuetzpalli mixtecus is a basal squamate, possibly a basal iguanian from the Early Cretaceous of the Tlayúa Formation, Tepexi de Rodríguez, Central Mexico....	H. mixtecus		A possible basal iguania Iguania Iguania is the suborder of Squamata that contains the iguanas, chameleons, agamids, and "New World lizards" such as anoles and Phrynosomatidae... n
Pamizinsaurus Pamizinsaurus Pamizinisaurus is a genus of sphenodontian reptile known from Lower Cretaceous Tlayúa Formation of Mexico. A crushed skeleon of a juvenile reptile was found in Tlayua Quarry, in central Mexico. It was named Pamizinsaurus tlayuaensis by Reynoso in 1997, after the name of the quarry of which it...	P. tlayuaensis		An osteoderm Osteoderm Osteoderms are bony deposits forming scales, plates or other structures in the dermal layers of the skin. Osteoderms are found in many groups of extant and extinct reptiles, including lizards, various groups of dinosaurs , crocodilians, phytosaurs, aetosaurs, placodonts, and hupehsuchians... -covered sphenodontia Sphenodontia Sphenodontia is an order of lizard-like reptiles that includes only one living genus, the tuatara , and only two living species... n
Ankylosphenodon	A. pachyostosus		An aquatic sphenodontia Sphenodontia Sphenodontia is an order of lizard-like reptiles that includes only one living genus, the tuatara , and only two living species... n
Tepexisaurus	T. tepexii		A basal scincomorph Scincomorpha Scincomorpha is an infraorder of saurians....

Cyanobacteria, foraminifera

Foraminifera

The Foraminifera , or forams for short, are a large group of amoeboid protists which are among the commonest plankton species. They have reticulating pseudopods, fine strands of cytoplasm that branch and merge to form a dynamic net...

, algae

Algae

Algae are a large and diverse group of simple, typically autotrophic organisms, ranging from unicellular to multicellular forms, such as the giant kelps that grow to 65 meters in length. They are photosynthetic like plants, and "simple" because their tissues are not organized into the many...

, gymnosperms, sponges,
cnidarians, annelids, gastropods, ammonites, bivalves, arachnids,
insects, isopods, anomurans, brachyurans, crinoids, echinoids,
holothuroids, stelleroids

Stelleroidea

Stelleroidea is a superclass of marine invertebrates including three classes:* Asteroidea: true sea stars* Ophiuroidea: brittle stars and basket stars* Somasteroidea : ancestral stelleroids...

, ophiuroids, fishes, chelonians, pterosaurs,
and crocodiles have also been recovered from the Tlayúa Formation.