La Boca Formation

The La Boca Formation is a geological formation in Tamaulipas state, northeast Mexico. It dates back to the Early Jurassic, concretely the Pliensbachian stage epoch.[2][3]

La Boca Formation
Stratigraphic range: Early Jurassic, Pliensbachian [1]
TypeGeological formation
UnderliesLa Joya Formation
OverliesHuizachal Formation

Fossil record

Vertebrate fauna

Vertebrates of the La Boca Formation
Genus Species Location Stratigraphic position Abundance Notes Images


B. tamaulipensis[1]

A basal Mammaliaform[1]

Bocatherium[4] Williston proposed the Sphenodontia to include only tuatara and their closest fossil relatives in 1925.[4]

B. mexicanum[4]

A Tritylodontid[4]

Unnamed Ceratosaur[3]

Unnamed Crocodyliforms[4]


C. huizachalensis

A Sphenodont


D. weintraubi

A Pterosaur

Indeterminate Heterodontosaurid remains[5]


H. wiblei[1]

A Gobiconodont[1]

Possible indeterminate Sauropod remains[3]

Unnamed Mammaliaforms (IGM 6622,IGM 6855, and IGM 6856)[1]


S. jimmysjoyi[6]

A venomous Sphenodont[6]


T. morenoi

A strange burrowing Diapsid

Indeterminate Theropod remains[3]


V. inaequalis[1]

A Triconodontid[1]


Z. ejidoensis

A dwarf Sphenodont

See also


  1. Montellano, M., J. A. Hopson, and J. M. Clark. 2008. Late Early Jurassic mammaliaforms from Huizachal Canyon, Tamaulipas, Mexico. Journal of Vertebrate Paleontology 28:1130–1143.
  2. Mesozoic Sedimentary and Tectonic History of North-central Mexico, Issue 340, pg 206; edited by Claudio Bartolini, James Lee Wilson, Timothy Frost Lawton.
  3. Weishampel, David B; et al. (2004). "Dinosaur distribution (Middle Jurassic, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 537–538. ISBN 0-520-24209-2.
  4. Fraser, Nicholas; Sues, Hans-Dieter, eds. (1994). In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods. Cambridge University Press. ISBN 0-521-45242-2.
  5. Clark, James; Montellano, Marisol; Hopson, James A.; Hernandez, Rene; Fastovsky, David A. (1994). "An Early or Middle Jurassic tetrapod assemblage from the La Boca Formation, northeastern Mexico". In Fraser, N.C.; Sues H.-D. (eds.). In The Shadow of the Dinosaurs: Early Mesozoic Tetrapods. Cambridge: Cambridge University Press. pp. 295–302. ISBN 0-521-45899-4.
  6. Reynoso, V.H. 2005. Possible evidence of a venom apparatus in a Middle Jurassic sphenodontian from the Huizachal red beds of Tamaulipas, Mexico. Journal of Vertebrate Paleontology 25: 646–653. doi:10.1671/0272-4634(2005)025[0646:PEOAVA]2.0.CO;2

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