Where: Tamaulipas, Mexico (26.6° N, 99.5° W: paleocoordinates 26.6° N, 99.5° W)
• coordinate based on nearby landmark
• local area-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).
• member-level stratigraphic resolution
Environment/lithology: "floodplain"; lithified, volcaniclastic siltstone
Size classes: macrofossils, mesofossils
Collected by J. Clark in 1982-
Collection methods: surface (float), surface (in situ), mechanical,
• IGM: Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico
Primary reference: J. M. Clark and J. A. Hopson. 1985. Distinctive mammal-like reptile from Mexico and its bearing on the phylogeny of the Tritylodontidae. Nature 315(6018):398-400 [M. Carrano/M. Carrano/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 28212: authorized by Matthew Carrano, entered by Matthew Carrano on 30.01.2003, edited by Richard Butler and Jonathan Tennant
Creative Commons license: CC BY (attribution)
Taxonomic list
Osteichthyes | |
Bocatherium mexicanum n. sp.
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Mammalia | |
Huasteconodon wiblei n. gen. n. sp.2
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Reptilia | |
? Metasuchia indet.1 crocodilian "new species"; IGM 3498 & additional specimens. Partial skulls and postcranial skeletons
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Cynosphenodon huizachalensis n. gen. n. sp.3
Cynosphenodon huizachalensis n. gen. n. sp.3 Reynoso 1996 lepidosaur IGM 6652, dentary. IGM 6653-6660, upper and lower jaws, and 16 incomplete lower jaws
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