Anacleto Formation

Coordinates: 37°54′S 68°30′W / 37.9°S 68.5°W / -37.9; -68.5
Source: Wikipedia, the free encyclopedia.
Anacleto Formation
Ma
Approximate paleocoordinates
40°48′S 53°00′W / 40.8°S 53.0°W / -40.8; -53.0
RegionNeuquén, Mendoza & Río Negro Provinces
Country Argentina
ExtentNeuquén Basin
Type section
Named forAguada de Anacleto
Anacleto Formation is located in Argentina
Anacleto Formation

The Anacleto Formation is a

Río Colorado Subgroup. Formerly that subgroup was treated as a formation, and the Anacleto Formation was known as the Anacleto Member.[1]

The type locality of this formation lies 40 kilometres (25 mi) west of the city of Neuquén. At its base, the Anacleto Formation conformably overlies the Bajo de la Carpa Formation, also of the Río Colorado Subgroup, and it is in turn unconformably overlain by the Allen Formation of the younger Malargüe Group.[2]

The Anacleto Formation varies between 60 and 90 metres (200 and 300 ft) thick, and consists mainly of

lacustrine and floodplain environments. Geodes are often found scattered throughout this formation.[3]

Fossil content

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.

The following animals are known from bones found in the Anacleto Formation:

Crocodylomorphs

Crocodylomorphs
reported from the Anacleto Formation
Genus Species Presence Material Notes Images
Gasparinisuchus G. peirosauroides Cañadón Amarrillo, south Malargüe city, Mendoza Province.[4] PV-CRIDC-12 (right premaxilla and maxilla, isolated teeth, and part of the postcranial skeleton).[4] A peirosaurid also known from the Bajo de la Carpa Formation.
Peirosaurus P. torminni Cañadón Amarrillo, south Malargüe city, Mendoza Province.[4] PV-CRIDC-12 (right premaxilla and maxilla, isolated teeth, and part of the postcranial skeleton).[4] Specimen reassigned to Gasparinisuchus.

Dinosaurs

Ornithischians

Ornithischians reported from the Anacleto Formation
Genus Species Stratigraphic position Presence Material Notes Images
Gasparinisaura G. cincosaltensis Cinco Saltos, Río Negro Province.[5] Multiple specimens.[5] A small ornithopod.

Sauropods

Nests of dinosaur eggs, many with preserved embryos inside, have been discovered in large quantities at the famous Auca Mahuevo locality, and have been attributed to titanosaurs.[6]

Sauropods
reported from the Anacleto Formation
Genus Species Stratigraphic Position Presence Material Notes Images
Antarctosaurus A. wichmannianus [7] A titanosaur.
Barrosasaurus B. casamiquelai Lower Neuquén Province.[8] Vertebrae.[8] A titanosaur.
Laplatasaurus L. araukanicus Uppermost Several localities in Patagonia.[9] Multiple specimens.[9] A titanosaur.
Narambuenatitan N. palomoi Lower Remains of a subadult.[10] A titanosaur.
Neuquensaurus N. australis Uppermost Cinco Saltos, Río Negro Province.[11] A saltasaurine.
Pitekunsaurus P. macayai "Braincase, left frontal, one tooth, four cervical vertebrae, three dorsal vertebrae, four caudal vertebrae, right ulna and scapula, proximal extreme of left femur, rib fragments and uncertain remains".[12] A titanosaur.
Teratopodus T. malarguensis Southern Mendoza Province.[13] Footprint trackways.[13] A titanosaur ichnotaxon.

Theropods

The oldest known unequivocal

ichnogenus Aquatilavipes and might have been produced by Patagopteryx (whose fossils were only found in the Bajo de la Carpa Formation however) or some unknown wader-like bird; they lack a hind toe. Ignotornis refers to similar footprints made by larger birds with a small hind toe; they might have been left by Neuquenornis, but this is also only known from the Bajo de la Carpa Formation. Footprints of these two ichnogenera have also been found elsewhere, but it must be understood that assignment to the same ichnogenus does not imply a close relatedness of the organisms that produced these traces, only a similar morphology.[14]

Even smaller and somewhat unusual footprints assigned to

Yungavolucris brevipedalis, but this is only known from the Maastrichtian Lecho Formation which is some 10 million years younger.[15]

Theropods
reported from the Anacleto Formation
Genus Species Stratigraphic Position Presence Material Notes Images
Abelisauridae Indeterminate Lower Northwest Patagonia.[16][17] MPCN-PV 69, consisting of a partial premaxilla, fragmentary vertebrae, proximal portion of both humeri, distal portion of the pubis, and an incomplete pedal ungual.[16][17] An indeterminate abelisaurid.
Abelisaurus A. comahuensis Lago Pellegrini stone quarries.[18] Skull.[18] An abelisaurid, originally thought to be from the Allen Formation.
Aerosteon A. riocoloradensis "Cañadon Amarillo (S 37.5°, W 70.5°), north of
Río Colorado near the southern border of Mendoza Province, Argentina."[19]
 Skeletal remains.[19] A
megaraptorid
.
Aucasaurus A. garridoi Upper Auca Mahuevo.[20] Skeleton of an adult (MCF-PVPH-236).[20] An abelisaurid.
Megaraptora indet. Indeterminate Upper Auca Mahuevo.[21] MCF-PVPH-416, a fragmentary pubic boot with unfused proximal symphysial contact.[21] A large megaraptoran.

Squamates

Squamates
reported from the Anacleto Formation
Genus Species Presence Material Notes Images
Dinilysia D. sp. Aguada Toledo, south of
Mari Menuco Lake.[22]
 24 articulated mid-posterior trunk vertebrae with the base of their respective ribs (UNC-CIP 1).[22] A large snake.

Testudines

Testudines
reported from the Anacleto Formation
Genus Species Stratigraphic Position Presence Material Notes Images
Prochelidella P. palomoi Aguada Grande site, Neuquén Province.[23] A partially preserved skull,
plastron, and a left ilium (MAU-Pv-AG-452).[23]
 A chelid turtle.
Yaminuechelys Y. aff. maior Lower Neuquén Province.[24] Two specimens (MAU-Pv-N-475 & MAU-Pv-PR-455).[24] A long-necked chelid turtle.


See also

References

  1. ^ Sánchez et al. (2006)
  2. ^ Fossa Mancini et al. (1938), Leanza et al. (2004)
  3. ^ Leanza et al. (2004), Sánchez et al. (2006)
  4. ^
    ISSN 0195-6671
    .
  5. ^
    S2CID 132358890
    .
  6. ^ Salgado et al. (2005), Sánchez et al. (2006)
  7. ^ von Huene, F. (1929). "Los saurisquios y ornitisquios del Cretáceo Argentino". Anales del Museo de la Plata (in Spanish). 3 (3): 1–196.
  8. ^
    ISSN 1175-5334
    .
  9. ^
    S2CID 131595654
    .
  10. ^ "A new titanosaur sauropod dinosaur from the Upper Cretaceous of North Patagonia, Argentina - Acta Palaeontologica Polonica". www.app.pan.pl. Retrieved 2022-12-07.
  11. S2CID 85606492
    .
  12. ^ Filippi, L.; Garrido, Alberto (September 2008). "Pitekunsaurus macayai gen. et sp. nov., New titanosaur (Saurischia, Sauropoda) From Upper Cretaceous NeuquéN Basin, Argentina". Ameghiniana. 45 (3): 575–590.
  13. ^
    S2CID 238695181
    .
  14. ^ Coria et al. (2002), Lockley et al. (2006)
  15. ^ Chiappe (1993), Coria et al. (2002), Lockley et al. (2006)
  16. ^
    ISSN 0195-6671
    .
  17. ^
    ISSN 0895-9811
    .
  18. ^ a b Bonaparte, J.; Novas, E.E. (1985). "Abelisaurus comahuensis, n.g., n.sp., Carnosauria del Crétacico Tardio de Patagonia" [Abelisaurus comahuensis, n.g., n.sp., Carnosauria from the Late Cretaceous of Patagonia]. Ameghiniana. 21: 259–265 – via ResearchGate.
  19. ^
    PMID 18825273
    .
  20. ^
    S2CID 131148538
    . Retrieved 2022-12-07.
  21. ^ a b Baiano, Mattia; Coria, Rodolfo (2018-05-14). "Revisiting Theropod Material from the Late Cretaceous Nesting Site Auca Mahuevo and the Possible Record of a Giant Megaraptoran". ResearchGate (Abstract).
  22. ^
    S2CID 86744198
    .
  23. ^
    S2CID 252566916
    .
  24. ^
    ISSN 1631-0683
    .

Bibliography

Further reading

  • S. Brizuela and A. Albino. 2011. A Scincomorpha lizard from the Campanian of Patagonia. Cretaceous Research 32:781-785
  • I. A. Cerda. 2008. Gastroliths in an ornithopod dinosaur. Acta Palaeontologica Polonica 53(2):351-355
  • L. M. Chiappe, R. A. Coria, L. Dingus, F. Jackson, A. Chinsamy and M. Fox. 1998. Sauropod dinosaur embryos from the Late Cretaceous of Patagonia. Nature 396:258-261
  • R. A. Coria and L. M. Chiappe. 2000. Un nuevo terópodo abelisaurio de la Fm. Río Colorado (Cretácico Superior) de la Provincia del Neuquén [A new abelisaur theropod from the Río Colorado Fm. (Upper Cretaceous) of Neuquén province]. Actas XVI Jornadas Argentinas de Paleontología de Vertebrado, San Luis, Argentina 13
  • L. S. Filippi and A. C. Garrido. 2012. Nuevo registro del género Dinilysia (Squamata, Serpentes) para la Formación Anacleto (Campaniano inferior-medio), Rincón de los Sauces, Neuquén, Argentina. Ameghiniana 49(1):132-136
  • B. J. González Riga. 2011. Speeds and stance of titanosaur sauropods: analysis of Titanopodus tracks from the Late Cretaceous of Mendoza, Argentina. Anais da Academia Brasileira de Ciências 83(1):279-290
  • A. M. Praderio, A. G. Martinelli, and C. R. A. Candeiro. 2008. Mesoeucrocodilos en el Cretácico de Malargüe: primer registro de Peirosaurus tormini (Crocodyliformes, Peirosauridae) para la provincia de Mendoza (Argentina). Actas del 4to. Encuentro Internacional del International Center of Earth Sciences (E-ICES-4), Malargüe, Mendoza 1-7
  • L. Salgado, S. Apesteguía, and S. Heredia. 2005. A new specimen of Neuquensaurus australis, a Late Cretaceous saltasaurine titanosaur from North Patagonia. Journal of Vertebrate Paleontology 25(3):623-634
  • L. Salgado, R. A. Coria, and S. E. Heredia. 1996. Nuevos materiales de ornitópodos (Ornithischia) en la Formación Rio Colorado (Cretácico Superior) de la Provincia de Rio Negro [New materials of ornithopods (Ornithischia) in the Rio Colorado Formation (Upper Cretaceous) of Rio Negro province]. Ameghiniana 33(4):471
  • P. C. Sereno, R. N. Martínez, J. A. Wilson, D. J. Varricchio, O. A. Alcober and H. C. E. Larsson. 2008. Evidence for avian intrathoracic air sacs in a new predatory dinosaur from Argentina. PLoS ONE 3(9):e3303:1-20
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