La Puerta Formation, Bolivia

La Puerta Formation
Stratigraphic range: Late Jurassic-Early Cretaceous ~150–140  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Sandstone
Location
Coordinates	19°30′S64°48′W / 19.5°S 64.8°W / -19.5; -64.8
Approximate paleocoordinates	19°36′S31°00′W / 19.6°S 31.0°W / -19.6; -31.0
Region	Chuquisaca Department
Country	Bolivia
La Puerta Formation, Bolivia (Bolivia)

The La Puerta Formation is a Late Jurassic to Early Cretaceous geologic formation of southern Bolivia. The fluvial and eolian sandstones preserve ichnofossils of Theropoda indet., Thyreophora indet., Ankylosauria indet. and Stegosauria indet. at the Tunasniyoj tracksite. ^[1] The formation is possibly a distal extension of the Botucatu Formation. ^[2] The Tunasniyoj assemblage is the oldest dinosaur tracksite for Bolivia, and includes the oldest known evidence assigned to ankylosaurs and stegosaurs for South America. ^[3]

See also

• List of fossiliferous stratigraphic units in Bolivia
• List of stratigraphic units with dinosaur tracks
  • List of stratigraphic units with theropod tracks
• Chaunaca Formation
• Toro Toro Formation

References

1. Tunasniyoj tracksite at Fossilworks.org
2. Apesteguía & Gallina, 2011, p.268
3. Apesteguía & Gallina, 2011, p.275

Bibliography

• Apesteguía, Sebastián; Gallina, P.A. (2011), "Tunasniyoj, a dinosaur tracksite from the Jurassic-Cretaceous boundary of Bolivia" (PDF), Anais da Academia Brasileira de Ciências , 83 (1): 267–277, doi:10.1590/S0001-37652011000100015, PMID   21437385 , retrieved 2019-03-03