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Facies

, 65:5 | Cite as

Bioerosion structures in a Late Cretaceous mosasaur from Antarctica

  • Marianella TaleviEmail author
  • Soledad Brezina
Original Article
  • 63 Downloads
Part of the following topical collections:
  1. Bioerosion: An interdisciplinary approach

Abstract

Bioerosive structures in the cortical region of a vertebra from a mosasaur fall in the López de Bertodano Formation (Upper Maastrichtian) in Seymour Island (Isla Marambio), Antarctica, are reported. The traces studied are similar but not coincident with the described microborings in other fossil bone remains. The morphology and extension of these bioerosive structures are considered as the result of the activity of endolithic organisms on the original vascular channels of the bone. They are approximately straight, anastomosed, and commonly filled with an opaque mineral and framboidal pyrite. As most of the bone structure is well preserved, only the small portion of the cortical region was exposed to the microorganisms’ activity. This would mean that the mosasaur individual died well earlier than the burial event. This is their first report of this type of bioerosive structures in a mosasaur fall.

Keywords

Bioerosive structures Marine reptile Cretaceous Antarctica 

Notes

Acknowledgements

The authors thank M. Tunik and M. Fernández for their assistance, the IAA (Instituto Antártico Argentino) and Fuerza Aérea Argentina for support in the field, M. Reguero for allowing the study of the material. This research was financially supported by grants from Agencia de Promoción Científica y Tecnológica (ANCyT) (PICT 2016-1039), Universidad Nacional de Río Negro PI UNRN 40-A-585, PI UNRN 40-A-660 and Programa de Incentivos de la Universidad Nacional de La Plata.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Instituto de Investigación en Paleobiología y Geología CONICET-Universidad Nacional de Río NegroGeneral RocaArgentina

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