Tacuarembó Formation

Tacuarembó Formation
Stratigraphic range: Kimmeridgian
~
TypeGeological formation
Sub-unitsBatoví Member
OverliesBuena Vista Formation
Lithology
PrimarySandstone
OtherSiltstone, mudstone
Location
Coordinates31°42′S 56°00′W / 31.7°S 56.0°W / -31.7; -56.0
Approximate paleocoordinates40°12′S 15°42′W / 40.2°S 15.7°W / -40.2; -15.7
RegionTacuarembó Department
CountryUruguay
ExtentNorte Basin
Type section
Named forTacuarembó
Tacuarembó Formation is located in Uruguay
Tacuarembó Formation
Tacuarembó Formation
Tacuarembó Formation
Tacuarembó Formation
Tacuarembó Formation (Uruguay)

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).

Fossil content

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

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Theropods

Theropods of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Abelisauridae Indet.[2][3][4] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian A abelisaurid theropod
Ceratosaurus[5][6][3] C. sp. Tacuarembó Department, Uruguay Kimmeridgian A ceratosaurid ceratosaur
Coelurosauria Indet. Indeterminate Tacuarembó Department, Uruguay Kimmeridgian A coelurosaurian theropod
Theropoda Indet.[7] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian An indeterminate theropod
Torvosaurus[8][3] T. sp. Tacuarembó Department, Uruguay Kimmeridgian A megalosaurine megalosaurid

Pterosaurs

Pterosaurs of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Tacuadactylus[9] T. luciae Tacuarembó Department, Uruguay Kimmeridgian A gnathosaurine ctenochasmatid

Crocodylomorphs

Crocodylomorphs of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Meridiosaurus[10] M. vallisparadisi Tacuarembó Department, Uruguay Kimmeridgian A pholidosaurid mesoeucrocodylian
Mesoeucrocodylia Indet.[11] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian An indeterminate mesoeucrocodylian

Turtles

Turtles of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Tacuarembemys[12][13] T. kusterae Tacuarembó Department, Uruguay Kimmeridgian An turtle
Testudines Indet.[11] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian An turtle

Fish

Cartilaginous Fish

Cartilaginous Fish of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Priohybodus[14][15] P. arambourgi Tacuarembó Department, Uruguay Kimmeridgian A hybodontid shark

Lobe-finned Fish

Lobe-finned Fish of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Arganodus[11] A. tiguidiensis Tacuarembó Department, Uruguay Kimmeridgian A arganodontid lungfish
Asiatoceratodus[11] A. tiguidiensis Tacuarembó Department, Uruguay Kimmeridgian A asiatoceratodontid lungfish
Mawsonia[16] M. gigas Tacuarembó Department, Uruguay Kimmeridgian A mawsoniid coelacanth
Neoceratodus N. africanus Tacuarembó Department, Uruguay Kimmeridgian A neoceratodontid lungfish

Ray-finned Fish

Ray-finned Fish of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Halecostomi Indet.[11] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian An fish
Semionotiformes Indet.[7] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian A semionotiform fish

Mollusks

Bivalves

Bivalves of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Diplodon[11] D. sp. Tacuarembó Department, Uruguay Kimmeridgian A hyriid mussel
Tacuaremboia[17] T. caorsii Tacuarembó Department, Uruguay Kimmeridgian A bivalve

Gastropods

Gastropods of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Viviparidae Indet.[11] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian

Ichnofossils

Ichnofossils of the Tacuarembó Formation
Genus Species Location Stratigraphic position Material Notes Image
Ornithopoda Indet.[18] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian
Sauropoda Indet.[18] Indeterminate Tacuarembó Department, Uruguay Kimmeridgian
Theropoda Indet.[18] Indeteminate Tacuarembó Department, Uruguay Kimmeridgian

See also

References

  1. ↑ Tacuarembó Formation at Fossilworks.org
  2. ↑ Hendrickx, C.; Soto Núñez, M.; Araújo, R.; Meso, J. G.; Maganuco, S.; Ben-Salahuddin, A. (2025). "Isolated abelisaurid teeth from Gondwana and dental evolution in Abelisauridae". Ameghiniana. doi:10.5710/AMGH.17.09.2025.3654.
  3. 1 2 3 Soto, Matías; Delcourt, Rafael; Langer, Max. C.; Perea, Daniel (2023). "The first record of Abelisauridae (Theropoda: Ceratosauria) from Uruguay (Late Jurassic, Tacuarembó Formation)". Historical Biology. 35 (12): 2362–2371. doi:10.1080/08912963.2022.2140425.
  4. ↑ Lagos, Leo (12 November 2022). "Uruguay tiene un tercer dinosaurio carnívoro jurásico: con ustedes, el abelisáurido delatado por un trozo de diente de Tacuarembó". la diaria (in Spanish). Retrieved 20 December 2025.
  5. ↑ Soto & Perea, 2008
  6. ↑ 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. Bibcode:2020JSAES.10302781S. doi:10.1016/j.jsames.2020.102781. ISSN 0895-9811. S2CID 224842133.
  7. 1 2 Perea et al., 2003
  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. Bibcode:2020JSAES..9802458S. doi:10.1016/j.jsames.2019.102458. ISSN 0895-9811. S2CID 213672502.
  9. ↑ Soto, M.; Montenegro, F.; Mesa, V.; Perea, D. (2021). "A new ctenochasmatid (Pterosauria, Pterodactyloidea) from the late Jurassic of Uruguay". Journal of South American Earth Sciences. 111 103472. doi:10.1016/j.jsames.2021.103472.
  10. ↑ Fortier et al., 2011
  11. 1 2 3 4 5 6 7 Soto & Perea, 2010
  12. ↑ Perea et al., 2014
  13. ↑ Perea, Daniel; Soto, Matías; Veroslavsky, Gerardo; Martínez, Sergio; Ubilla, Martín (2009). "A Late Jurassic fossil assemblage in Gondwana: Biostratigraphy and correlations of the Tacuarembó Formation, Parana Basin, Uruguay". Journal of South American Earth Sciences. 28 (2): 168–179. doi:10.1016/j.jsames.2009.03.009.
  14. ↑ Soto et al., 2012
  15. ↑ Perea, Daniel; Ubilla, Martin; Rojas, Alejandra; Goso, Cesar A. (November 2001). "The West Gondwanan Occurrence Of The Hybodontid Shark Priohybodus, And The Late Jurassic-Early Cretaceous Age Of The Tacuarembo Formation, Uruguay". Palaeontology. 44 (6): 1227–1235. doi:10.1111/1475-4983.00222. ISSN 0031-0239.
  16. ↑ Toriño, Pablo; Soto, Matías; Perea, Daniel; Salgado De Carvalho, Marise Sardenberg (2021-04-01). "New findings of the coelacanth Mawsonia Woodward (Actinistia, Latimerioidei) from the Late Jurassic – Early Cretaceous of Uruguay: Novel anatomical and taxonomic considerations and an emended diagnosis for the genus". Journal of South American Earth Sciences. 107 103054. doi:10.1016/j.jsames.2020.103054. ISSN 0895-9811.
  17. ↑ Martinez, Sergio; Figueiras, Alfredo; da Silva, Jorge S. (1993). "A new Unionoidea (Mollusca, Bivalvia) from the Tacuarembó Formation (Upper Triassic–Upper Jurassic), Uruguay". Journal of Paleontology. 67 (6): 962–965. doi:10.1017/s0022336000025270. ISSN 0022-3360.
  18. 1 2 3 Mesa & Perea, 2015

Bibliography

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