Casa de Fidencio, 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"; mudstone

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 136970: authorized by Richard Butler, entered by Richard Butler on 07.12.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

 Saurischia -
Coelophysoidea indet. Holtz 1994 coelophysoid
IGM 6624, articulated sacrum and pelvis
 Therapsida -
Mammaliaformes indet. Rowe 1988 mammaliaform
IGM 6622, partial right dentary