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High diverstity of latest Cretaceous arctic dinosaurs PDF Print E-mail
DinoNews - Dinonews 2009

Godefroit, P. Golovneva, L. Shchepetov, S. Garcia, G. & Alekseev, P. (2008) Tha last polar dinosaurs: high diverstity of latest Cretaceous arctic dinosaurs in Russia. Naturwissenshaften DOI 10.1007/s00114-008-0499-0

Abstract A latest Cretaceous (68 to 65 million years ago) vertebrate microfossil assemblage discovered at Kakanaut in northeastern Russia reveals that dinosaurs were still highly diversified in Arctic regions just before the Cretaceous– Tertiary mass extinction event. Dinosaur eggshell fragments, belonging to hadrosaurids and non-avian theropods, indicate that at least several latest Cretaceous dinosaur taxa could reproduce in polar region and were probably year-round residents of high latitudes. Palaeobotanical data suggest that these polar dinosaurs lived in a temperate climate (mean annual temperature about 10°C), but the climate was apparently too cold for amphibians and ectothermic reptiles. The high diversity of LateMaastrichtian dinosaurs in high latitudes, where ectotherms are absent, strongly questions hypotheses according to which dinosaur extinction was a result of temperature decline, caused or not by the Chicxulub impact.

 
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