[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Cretaceous chelonians from Bauru Basin, Brazil (free pdf) and ammonite bites.

From: Ben Creisler

A couple of non-dino papers that may be of interest:

Daniel Rogério, Ismar Carvalho & Lucas Mouro (2013)
Cretaceous chelonians from Marília Formation, Peirópolis, Minas
Gerais, Bauru Basin, Brazil.
Brazilian Journal of Geology, 43(2): 273-284
DOI: 10.5327/Z2317-48892013000200006
[pdf is free]

In the Upper Cretaceous deposits of Bauru Basin, the complete
specimens of chelonians are rare. However, a large amount of bone
fragments of Pleurodyra suborder is found. In the paleontological
sites located at Peirópolis (Uberaba, Minas Gerais), which belong to
Marília Formation (Maastrichtian – Campanian), there is one of the
best fossil registers for this group in Brazil. The 315 skeletal
remains collected in these outcrops and housed in the Complexo
Cultural e Científico de Peirópolis of Universidade Federal do
Triângulo Mineiro allow an assessment of the diversity and abundance
of Testudines during the Upper Cretaceous. A comparative analysis of
these fossils with specimens from other localities from Bauru Basin
enabled a better understanding of the chelonians of the region in the
Cretaceous period.


Shirley Odunze & Royal H. Mapes (2013)
Nearly circular, oval and irregular holes in Cretaceous ammonoids from Nigeria.
Lethaia 46(3): 409–415
DOI: 10.1111/let.12019

Nearly circular-, oval- and irregular-shaped holes are present in a
collection of Late Cretaceous ammonoid cephalopods from southern
Nigeria. Two competing hypotheses have been advanced to explain these
holes: one is they were produced by diagenetic crushing of limpet home
scars and the other is that they are predator's teeth marks. The
latter explanation appears to be the best explanation for some of the
damage seen in the Nigerian specimens. The suspected predator for some
of the specimens was probably an unidentified reptile based on the
diameters of the holes. Insofar as we are aware, this is the first
recorded predatory damage reported on Cretaceous ammonoids from
West-Central Africa.