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Dinosaurs and other vertebrates from Upper Cretaceous Ajka Coal Formation, Hungary



Ben Creisler
bcreisler@gmail.com


A new paper:

Attila Ősi, Emese Réka Bodor, László Makádi & Márton Rabi (2015)
Vertebrate remains from the Upper Cretaceous (Santonian) Ajka Coal
Formation, western Hungary.
Cretaceous Research 57: 228–238
doi:10.1016/j.cretres.2015.04.014
http://www.sciencedirect.com/science/article/pii/S019566711500066X

Highlights
Continental vertebrates from Upper Cretaceous swamp deposits are described.
These fossils reveal taxonomical overlapping with those from alluvial sediments.
Ankylosaurs preferred wetland habitats such as fluvial systems and
coastal regions.


Abstract
Vertebrate remains from the Upper Cretaceous (Santonian) Ajka Coal
Formation (Bakony Mountains, western Hungary) are described. Macro-
and microfossils collected from two boreholes and from isolated chunks
of sediment/matrix dumped on spoil heaps of the Jókai Mine represent
pycnodontiform and lepisosteiform fishes, bothremydid turtles, the
mosasauroid Pannoniasaurus inexpectatus, the crocodyliforms cf.
Theriosuchus, Iharkutosuchus makadii and cf. Allodaposuchus, as well
as ankylosaurian and theropod dinosaurs. This unit was deposited in a
swampy lacustrine environment, in contrast with the neighbouring and
contemporaneous floodplain deposit of the vertebrate-bearing Csehbánya
Formation at Iharkút. Despite significant environmental differences,
the faunal composition of the Ajka Coal Formation assemblage
completely overlaps with that of the Csehbánya Formation, suggesting
the occurrence of the same semi-aquatic and terrestrial species in
both settings. The ankylosaurian remains further strengthen the
previous view that ankylosaurus preferred wetland habitats such as
fluvial systems and coastal regions.