Tacuarembó Formation

The Tacuarembó Formation is a Late Jurassic (Kimmeridgian) geologic formation of the eponymous department in northern Uruguay. The fluvial to lacustrine sandstones, siltstones and mudstones preserve ichnofossils, turtles, crocodylomorphs, fish and invertebrates (bivalves and gastropods).

Tacuarembó Formation Stratigraphic range: Kimmeridgian ~155–151 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Sub-units	Batoví Member
Overlies	Buena Vista Formation
Lithology
Primary	Sandstone
Other	Siltstone, mudstone
Location
Coordinates	31.7°S 56.0°W
Approximate paleocoordinates	40.2°S 15.7°W
Region	Tacuarembó Department
Country	Uruguay
Extent	Norte Basin
Type section
Named for	Tacuarembó
Tacuarembó Formation (Uruguay)

Fossil content

The following fossils have been reported from the formation:[1]

• Reptiles
  • Meridiosaurus vallisparadisi[2]
  • Tacuarembemys kusterae[3]
  • Ceratosaurus sp.[4][5]
  • Coelurosauria indet.[6]
  • Mesoeucrocodylia indet.[7]
  • Testudines indet.[7]
  • Theropoda indet.[6]
  • Torvosaurus sp.[8]

• Fish
  • Arganodus tiguidiensis[7]
  • Asiatoceratodus cf. tiguidiensis[7]
  • Neoceratodus africanus[6]
  • Priohybodus arambourgi[9]
  • Halecostomi indet.[7]
  • Semionotiformes indet.[6]

• Bivalves
  • Diplodon sp.[7]

• Gastropods
  • Viviparidae indet.[7]

• Ichnofossils
  • Ornithopoda indet.[10]
  • Sauropoda indet.[10]
  • Theropoda indet.[10]

See also

• List of fossiliferous stratigraphic units in Uruguay

References

1. Tacuarembó Formation at Fossilworks.org
2. Fortier et al., 2011
3. Perea et al., 2014
4. Soto & Perea, 2008
5. Soto, Matías; Toriño, Pablo; Perea, Daniel (2020-11-01). "Ceratosaurus (Theropoda, Ceratosauria) teeth from the Tacuarembó Formation (Late Jurassic, Uruguay)". Journal of South American Earth Sciences. 103: 102781. doi:10.1016/j.jsames.2020.102781. ISSN 0895-9811.
6. Perea et al., 2003
7. Soto & Perea, 2010
8. Soto, Matías; Toriño, Pablo; Perea, Daniel (2020-03-01). "A large sized megalosaurid (Theropoda, Tetanurae) from the late Jurassic of Uruguay and Tanzania". Journal of South American Earth Sciences. 98: 102458. doi:10.1016/j.jsames.2019.102458. ISSN 0895-9811.
9. Soto et al., 2012
10. Mesa & Perea, 2015

Bibliography

• Mesa, V., and D. Perea. 2015. First record of theropod and ornithopod tracks and detailed description of sauropod trackways from the Tacuarembó Formation (Late Jurassic–?Early Cretaceous) of Uruguay. Ichnos 22. 109-121.
• Perea, D.; M. Soto; J. Sterli; V. Mesa; P. Torino; G. Roland, and J. Da Silva. 2014. Tacuarembemys kusterae, gen. et sp. nov., a new Late Jurassic-?earliest Cretaceous continental turtle from western Gondwana. Journal of Vertebrate Paleontology 34. 1329-1341.
• Soto, M.; D. Perea, and P. Torino. 2012. New remains of Priohybodus aramourgi (Hybodontiformes: Hybodontidae) from Late Jurassic-earliest Cretaceous deposits in Uruguay. Cretaceous Research 35. 118-123.
• Fortier, D.; D. Perea, and C. Schultz. 2011. Redescription and phylogenetic relationships of Meridiosaurus vallisparadisi, a pholidosaurid from the Late Jurassic of Uruguay. Zoological Journal of the Linnean Society 163. S257-S272.
• Soto, M., and D. Perea. 2010. Late Jurassic lungfishes (Dipnoi) from Uruguay, with comments on the systematics of Gondwanan ceradontiforms. Journal of Vertebrate Paleontology 30. 1049-1058.
• Soto, M., and D. Perea. 2008. A ceratosaurid (Dinosauria, Theropoda) from the Late Jurassic–Early Cretaceous of Uruguay. Journal of Vertebrate Paleontology 28. 439-444.
• Perea, D.; M. Ubilla, and A. Rojas. 2003. First report of theropods from the Tacuarembó Formation (Late Jurassic–Early Cretaceous), Uruguay. Alcheringa 27. 79-83.
• Perea, D.; M. Ubilla; A. Rojas, and C.A. Goso. 2001. The West Gondwanan occurrence of the hybodontid shark Priohybodus, and the Late Jurassic–Early Cretaceous age of the Tacuarembó Formation, Uruguay. Palaeontology 44. 1227-1235.