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Permian trackways from Brazil



From: Ben Creisler
bscreisler@gmail.com


A new online paper:

Rafael Costa da Silva, Fernando Antonio Sedor & Antonio Carlos
Sequeira Fernandes (2012)
Fossil footprints from the Late Permian of Brazil: an example of
hidden biodiversity.
Journal of South American Earth Sciences (advance online publication)
http://dx.doi.org/10.1016/j.jsames.2012.05.001
http://www.sciencedirect.com/science/article/pii/S089598111200051X?v=s5


Although Late Permian tetrapods are relatively common around the
world, few taxa are known in rocks of this age in South America. So
far, the study of the tetrapod paleofaunas in the Permian of Brazil
has provided significant chronological data, though knowledge about
them is still incipient. These studies generally take into account
only body fossil records, but the ichnological record can provides new
biostratigraphic elements for correlation. In Brazil, fossil tracks
were first recorded in Rio do Rasto and Corumbataí Formations (Late
Permian from Paraná Basin), but to date these tracks have not been
studied in an ichnotaxonomic, morphofunctional, paleoenvironmental and
chronological context. The study of these tracks became possible due
to a considerable increase in the number of taxa from the Late Permian
of Brazil, including Chelichnus isp. (Synapsida: Caseidae?),
Procolophonichnium isp. (Procolophonoidea), Rhynchosauroides gangresci
isp. nov. (basal Diapsida), Dicynodontipus penugnu isp. nov.
(Dicynodontia) and Incertae sedis (Amphibia?). With the exception of
Dicynodontia, the remaining recorded taxa are unknown through fossil
skeletons, showing that the Brazilian Permian faunas were much more
diverse than was previously reported and demonstrating the potential
of South American fossil vertebrates for global correlations.