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Hyperodapedon occurrence in Late Triassic of Brazil (free pdf)



Ben Creisler
bcreisler@gmail.com


 A recent paper in open access:

Bruno Ludovico Dihl Horn, Cesar Leandro Schultz, Ana Emília Quezado de
Figueiredo & Filipe Armando Motta (2015)
Recognition of the Hyperodapedon Assemblage Zone (Late Triassic) in a
relictual occurrence over the Sul-Rio-Grandense Shield.
Revista Brasileira de Paleontologia 18(1): 91-96
doi: 10.4072/rbp.2015.1.06
http://www.sbpbrasil.org/assets/uploads/files/06_Horn_et_al_pg91a96.pdf



A group of isolated occurrences of sedimentary rocks located over the
Sul-Rio-Grandense Shield, first described as a temporally intermediate
unit between the upper deposits of Camaquã Basin and the lower
deposits of Paraná Basin was named Caneleiras Formation, with an
inferred Devonian age. Later, the discovery of vertebrate fossils
(mainly rhynchosaurs) allowed the stratigraphical assignment of these
rocks to the Triassic, correlated to the Santa Maria Formation.
However, none of the fossils were complete enough to allow a precise
taxonomic assignment, hampering more detailed biostratigraphic
correlations. This work reports a new rhynchosaur specimen from an
outcrop located at Campinas River, near Santana da Boa Vista, Rio
Grande do Sul, Brazil. The presence of one maxillary groove allows
assigning the material to the genus Hyperodapedon, index fossil of the
Hyperodapedon AZ, which corresponds to the base of the Candelária
Sequence, Santa Maria Supersequence. This occurrence shows that, at
least on Upper Triassic, the depositional area of the Santa Maria
Sequence extended southward of the actual outcrop belt, covering
portions of the Shield.