Cementario, Huizachal Canyon: Pliensbachian, Mexico
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
unclassified
|
||||||||||
| 2 specimens | ||||||||||
| IGM 6855, partial right dentary; IGM 6856, left dentary | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Mexico | State/province: | Tamaulipas |
| Coordinates: | 26.6° North, 99.5° West (view map) | ||
| Paleocoordinates: | |||
| Basis of coordinate: | based on nearby landmark | ||
| Altitude: | 146 meters | ||
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Early Jurassic |
| Stage: | Pliensbachian | 10 m.y. bin: | Jurassic 2 |
| Key time interval: | Pliensbachian | ||
| Age range of interval: | 192.9 - 184.2 m.y. ago | ||
| Age estimate: | maximum 189 ± 0.2 Ma (U/Pb) |
Stratigraphy
| Geological group: | Huizachal | Formation: | La Boca | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: 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). | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | "floodplain" |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | mesofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: IGM: Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico | |
Metadata
| Database number: | 136977 | ||
| Authorizer: | R. Butler | Enterer: | R. Butler |
| Modifier: | G. Varnham | Research group: | vertebrate |
| Created: | 2012-12-07 20:43:37 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2012-12-07 20:43:37 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 43805. | M. Montellano, J. A. Hopson, and J. M. Clark. 2008. Late Early Jurassic mammaliaforms from Huizachal Canyon, Tamaulipas, Mexico. Journal of Vertebrate Paleontology 28(4):1130-1143 [R. Butler/R. Butler] |