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 (Huizachal Group), 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: J. M. Clark, M. Montellano, J. A. Hopson, R. Hernandez, and D. E. Fastovsky. 1994. An Early or Middle Jurassic tetrapod assemblage from the La Boca Formation, northeastern Mexico. In N. C. Fraser, H.-D. Sues (eds.), In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods 295-302 [R. Butler/R. Butler/R. Butler]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 136969: authorized by Richard Butler, entered by Richard Butler on 07.12.2012, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)