Dinosaur National Monument South, Huizachal Canyon (Jurassic of Mexico)

Where: Tamaulipas, Mexico (26.6° N, 99.5° W: paleocoordinates 26.6° N, 99.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: La Boca Formation, Pliensbachian (190.8 - 182.7 Ma)

• lower part of the La Boca Formation; originally dated as Middle Jurassic, but U-Pb isotopic data from zircon in a volcaniclastic rock from the lowest part of the formation yields an age of 189 plus/minus 0.2 Ma. The fossil-bearing sedimentary rocks are above this unit and conformable with it (see Montellano et al. 2008: JVP 28: 1130–1143).

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; lithology not reported

Size classes: macrofossils, mesofossils

Collection methods: IGM: Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico

Primary reference: R. C. Munter and J. M. Clark. 2006. Theropod dinosaurs from the Early Jurassic of Huizachal Canyon, Mexico. In M. T. Carrano, T. J. Gaudin, R. W. Blob, J. R. Wible (eds.), Amniote paleobiology: perspectives on the evolution of mammals, birds, and reptiles. University of Chicago Press, Chicago 53-75 [O. Rauhut/O. Rauhut]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136967: authorized by Richard Butler, entered by Richard Butler on 07.12.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Diapsida indet.2
"new species"; "Burrowing diapsid representing a heretofore unknown clade"
Reptilia
 Ornithischia - Heterodontosauridae
cf. Heterodontosaurus sp.2 Crompton and Charig 1962 heterodontosaurid
Isolated teeth
 Diapsida -
Tamaulipasaurus morenoi n. gen. n. sp.1
Tamaulipasaurus morenoi n. gen. n. sp.1 Clark and Hernandez 1994 diapsid
"new species"; "Burrowing diapsid representing a heretofore unknown clade"