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Theses

De la vie à la pierre : préservation exceptionnelle d'arthropodes marins fossiles

Abstract : The fossil record is incomplete and does not really account for ancient biodiversity. Some exceptionally well-preserved deposits are rich in "soft" organisms that are rarely fossilized. X-ray tomography has revealed remarkable biological structures (eggs, internal organs) allowing us, for example, to reconstruct reproductive traits in Polychelida (Decapoda) from the Jurassic site of La Voulte-sur-Rhône. As the causes of such preservation are still poorly known, in situ analyses of the mineralogical composition of fossil arthropods have enabled us to reconstruct the fossilization processes at the same site and at a Cretaceous site in Lebanon. We thus show that biodegradation is essential in fossilization, and that the mode of preservation is explained by the precipitation around the fossil of a concretion (volume fossils) or not (flat fossils). We discuss the effect of microenvironments and associated microorganisms.
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Submitted on : Friday, March 12, 2021 - 3:18:52 AM
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  • HAL Id : tel-03145697, version 2

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Clément Jauvion. De la vie à la pierre : préservation exceptionnelle d'arthropodes marins fossiles. Paléontologie. Museum national d'histoire naturelle - MNHN PARIS, 2020. Français. ⟨NNT : 2020MNHN0005⟩. ⟨tel-03145697v2⟩

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