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Défense de thèse de doctorat en sciences géologiques, par Aude Cincotta

Taphonomy of fossil integumentary structures and bones from Ornithodira : chemical composition and modes of preservation

Catégorie : défense de thèse
Date : 15/12/2017 16:00 - 15/12/2017 18:00
Lieu : Amphithéâtre CH01, rue Grafé, 5000 Namur
Orateur(s) : Aude CINCOTTA
Organisateur(s) : Johan YANS
Jury

Pascal GODEFROIT, co-promoteur (Institut Royal des Sciences Naturelles de Belgique), Géraldine GARCIA (Université de Poitiers), Maria McNAMARA (University College Cork), Vinciane DEBAILLE (ULB), Guy TERWAGNE, président (UNamur), Vincent HALLET (UNamur), Johan YANS, promoteur (UNamur)

Résumé

Soft tissues are non biomineralised tissues that may, in specific cases, be preserved in the geological record, bringing valuable information on the biology of extinct organisms. This dissertation focuses on the study of the modes of preservation of fossil soft tissues, especially integumentary structures such as feathers, from four different specimens of Ornithodira, the clade including dinosaurs and pterosaurs. The studied specimens include two small theropod dinosaurs from the Late Jurassic of Liaoning (China), Anchiornis huxleyi and Serikornis sungei; a neornithischian dinosaur from the Middle Jurassic of Siberia, Kulindadromeus zabaikalicus; and a tapejarid pterosaur from the Aptian of Brazil, Tupandactylus cf. imperator. A series of modern analytical techniques were used to study the ultrastructure of the soft tissues and to characterise their chemical composition. The thesis also presents palaeoenvironmental reconstructions of two different vertebrate-bearing localities in order to understand the fossilization modes of their fossils.

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