5 research outputs found
New protoceratopsid specimens improve the age correlation of the Upper Cretaceous Gobi Desert strata
New protoceratopsid (Dinosauria: Ceratopsia) specimens from two Late Cretaceous Mongolian localities with problematic
stratigraphy are described. A specimen of Protoceratops andrewsi from the Zamyn Khond locality enables its
correlation with other sites of the Djadokhta Formation. P. andrewsi is also abundant in the ĂĂŒden Sair locality, variously
assigned to the Djadokhta or Baruungoyot formations. However, one new specimen from that site exhibits a fused nasal
horn and a sharp buccal crest of the dentary. With these apomorphic features, it resembles Bagaceratops rozhdestvenskyi,
known from the Baruungoyot and Bayan Mandahu formations. It may be an evidence for: sympatric evolution of
B. roz hdestvenskyi and P. andrewsi; a dispersal of Bagaceratops to ĂĂŒden Sair; hybridization between the two parapatric
taxa; or the anagenetic evolutionary transition from P. andrewsi to Bagaceratops. The anagenetic explanation appears to
be most strongly supported by given data. This new record advocates for the age of the sediments from the ĂĂŒden Sair
locality being intermediate between the Djadokhta and Baruungoyot formations. The observed changes in the frequency
of the apomorphic features within protoceratopsid samples from various Late Cretaceous sites of the Gobi Desert potentially
enable their correlations and chronological ordering
Revision of fossils from the current territory of Poland housed in the Natural History Museum in Vienna
Current territory of Poland was an exploration area for paleontologists from other European countries throughout the almost entire nineteenth century. A considerable part of findings were stored in institutions located beyond current borders of Poland. We have examined, documented and identified above 350 fossils housed in the Natural History Museum in Vienna (Naturhistorisches Museum Wien). The collection includes paleobotanical and paleozoological specimens from the Little Poland and the Upper Silesia. Some of these specimens are a unique material from the localities which are no longer available