A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group

Castro, Mariela C.; Goin, Francisco J.; Jaureguizar, Edgardo Ortiz; Vieytes, Emma Carolina; Tsukui, Kaori; Ramezani, Jahandar; Batezelli, Alessandro; Marsola, Júlio C. A.; Langer, Max C.

doi:10.1098/rsos.180482

Cited by 58 publications

(37 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fossil content of the Bauru Basin is mainly concentrated in the Bauru Group, which records a plethora of vertebrates, including dinosaurs, crocodilians, turtles, lizards, anurans, birds, and mammals 28–30 . As a whole, the fauna of the Bauru Group indicates a Coniacian to Maastrichtian age 27 , as corroborated by a recent radioisotopic dating 31 . Fossils are much rarer in the Caiuá Group, hampering the determination of its biostratigraphic correlations.…”

Section: Introductionsupporting

confidence: 53%

“…Nonetheless, the scarce record of pterosaurs in general casts doubts upon their utility for such correlations. On the other hand, a younger (Late Cretaceous) age can be suggested based on its inferred depositional synchronicity 21 with rocks of the recently dated (as Coniacian to Campanian) Adamantina Formation 31 . According to some stratigraphic schemes, the Caiuá Group is composed of three coeval units: the Rio Paraná, Goio Erê, and Santo Anastácio formations.…”

Section: Geological Settingsmentioning

confidence: 99%

See 1 more Smart Citation

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

Langer

Martins²,

Manzig³

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Noasaurines form an enigmatic group of small-bodied predatory theropod dinosaurs known from the Late Cretaceous of Gondwana. They are relatively rare, with notable records in Argentina and Madagascar, and possible remains reported for Brazil, India, and continental Africa. In south-central Brazil, the deposits of the Bauru Basin have yielded a rich tetrapod fauna, which is concentrated in the Bauru Group. The mainly aeolian deposits of the Caiuá Group, on the contrary, bear a scarce fossil record composed only of lizards, turtles, and pterosaurs. Here, we describe the first dinosaur of the Caiuá Group, which also represents the best-preserved theropod of the entire Bauru Basin known to date. The recovered skeletal parts (vertebrae, girdles, limbs, and scarce cranial elements) show that the new taxon was just over 1 m long, with a unique anatomy among theropods. The shafts of its metatarsals II and IV are very lateromedially compressed, as are the blade-like ungual phalanges of the respective digits. This implies that the new taxon could have been functionally monodactyl, with a main central weight-bearing digit, flanked by neighbouring elements positioned very close to digit III or even held free of the ground. Such anatomical adaptation is formerly unrecorded among archosaurs, but has been previously inferred from footprints of the same stratigraphic unit that yielded the new dinosaur. A phylogenetic analysis nests the new taxon within the Noasaurinae clade, which is unresolved because of the multiple alternative positions that Noasaurus leali can acquire in the optimal trees. The exclusion of the latter form results in positioning the new dinosaur as the sister-taxon of the Argentinean Velocisaurus unicus .

show abstract

Section: Introductionsupporting

confidence: 53%

Section: Geological Settingsmentioning

confidence: 99%

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

Langer

Martins²,

Manzig³

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…There are no integrative absolute date studies for the Adamantina Formation to specify the age correlation among the different fossiliferous localities found in the Bauru Group. Recently, the first high-precision U-Pb geochronology study has shown a post-Turonian maximal age ( ≤ 87.8 Ma) for the type stratum of Brasilestes stardusti ( Castro et al., 2018 ), which is overlain by the dinosaur-bearing Marília Formation; this age thus constrains the maximum age of the Adamantina Formation at the Boipeba site. The minimum age is not well constrained, but presence of non-avian dinosaurs in higher beds implies an age pre-dating the Cretaceous-Paleogene (K/Pg) boundary (66 Ma) ( Batezelli, 2017 ; Menegazzo et al., 2016 ).…”

Section: Resultsmentioning

confidence: 97%

Cretaceous Blind Snake from Brazil Fills Major Gap in Snake Evolution

et al. 2020

View full text Add to dashboard Cite

Summary Blind snakes (Scolecophidia) are minute cryptic snakes that diverged at the base of the evolutionary radiation of modern snakes. They have a scant fossil record, which dates back to the Upper Paleocene-Lower Eocene (∼56 Ma); this late appearance conflicts with molecular evidence, which suggests a much older origin for the group (during the Mesozoic: 160–125 Ma). Here we report a typhlopoid blind snake from the Late Cretaceous of Brazil, Boipeba tayasuensis gen. et sp. nov, which extends the scolecophidian fossil record into the Mesozoic and reduces the fossil gap predicted by molecular data. The new species is estimated to have been over 1 m long, much larger than typical modern scolecophidians (<30 cm). This finding sheds light on the early evolution of blind snakes, supports the hypothesis of a Gondwanan origin for the Typhlopoidea, and indicates that early scolecophidians had large body size, and only later underwent miniaturization.

show abstract

“…As a consequence, following the reasoning that Uberaba and Adamantina formations can be correlated, at least part of the Adamantina Formation can be considered Campanian. A recent study ( Castro et al, 2018 ) provides high-precision U-Pb post-Turonian maximal age for an outcrop of the Adamantina Formation located in western São Paulo state, suggesting a late Coniacian–late Maastrichtian temporal constraint. However, the absolute age of the FTA’s outcrops is unknown and we consider them as belong to the upper part of the Late Cretaceous.…”

Section: Introductionmentioning

confidence: 99%

The firstCaipirasuchus(Mesoeucrocodylia, Notosuchia) from the Late Cretaceous of Minas Gerais, Brazil: new insights on sphagesaurid anatomy and taxonomy

Martinelli

Fv³

et al. 2018

PeerJ

View full text Add to dashboard Cite

Field work conducted by the staff of the Centro de Pesquisas Paleontológicas Llewellyn Ivor Price of the Universidade Federal do Triângulo Mineiro since 2009 at Campina Verde municipality (MG) have resulted in the discovery of a diverse vertebrate fauna from the Adamantina Formation (Bauru Basin). The baurusuchid Campinasuchus dinizi was described in 2011 from Fazenda Três Antas site and after that, preliminary descriptions of a partial crocodyliform egg, abelisaurid teeth, and fish remains have been done. Recently, the fossil sample has been considerably increased including the discovery of several, partially articulated fish remains referred to Lepisosteiformes and an almost complete and articulated skeleton referred to a new species of Caipirasuchus (Notosuchia, Sphagesauridae), which is the main subject of this contribution. At present, this genus was restricted to the Adamantina Formation cropping out in São Paulo state, with the species Caipirasuchus montealtensis, Caipirasuchus paulistanus, and Caipirasuchus stenognathus. The new material represents the holotype of a new species, Caipirasuchus mineirus n. sp., diferenciated from the previously ones due to the following traits: last two maxillary teeth located posterior to anterior edge of infraorbital fenestra, elongated lateroventral maxillo-jugal suture—about ½ the anteroposterior maxillar length—and contact between posterior crest of quadrate and posterior end of squamosal forming an almost 90° flaring roof of the squamosal, among others. C. mineirus was found in the same outcrop than Campinasuchus but stratigraphically the former occurs in the lower portion of the section with no unambiguous data supporting the coexistance of both taxa.

show abstract

A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group

Cited by 58 publications

References 61 publications

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

Cretaceous Blind Snake from Brazil Fills Major Gap in Snake Evolution

The firstCaipirasuchus(Mesoeucrocodylia, Notosuchia) from the Late Cretaceous of Minas Gerais, Brazil: new insights on sphagesaurid anatomy and taxonomy

Contact Info

Product

Resources

About