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Synchrotron X-ray microdiffraction to study dental structures in Cretaceous crocodylomorphs



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Vallcorba, O. and Canillas, M. and Audije-Gil, Julia and Barroso Barcenilla, Fernando and González Martín, A. and Molera, J. and Rodríguez, M.A. and Cambra-Moo, Oscar (2021) Synchrotron X-ray microdiffraction to study dental structures in Cretaceous crocodylomorphs. Cretaceous research., 128 (104960). ISSN 0195-6671

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Synchrotron radiation X-ray microdiffraction (SR-μXRD) has been applied for the first time as a fundamental method of analysis to unveil crocodilian teeth growth and development. Teeth from a fossil crocodylomorph from the Upper Cretaceous site of Lo Hueco (Spain) and a modern crocodylian from the living species Crocodylus niloticus have been analysed. Both samples have been studied through Polarized Light Microscopy, Scanning Electron Microscopy coupled with Energy Dispersive X-Ray Spectroscopy, Confocal Raman Spectroscopy, and SR-μXRD. Significant differences have been found in hydroxyapatite (HA) crystallite sizes and texture, and the evolution of these two features along teeth depth. The main differences observed in crystallite size are related to postdepositional processes and/or the environmental and functional pressures of teeth during crocodylomorph life, very different from that of the modern specimen. Regarding the crystalline texture in the tooth enamel, it can be linked to teeth functionality during crocodilian life, causing the directed growth of HA crystallites due to the mechanical stress to which they are subjected.

Item Type:Article
Uncontrolled Keywords:Teeth, Cretaceous, Crocodylomorph,Crocodylus niloticus, Synchrotron radiation, X-ray microdiffraction, Biological apatite
Subjects:Sciences > Geology > Paleontology
ID Code:68140
Deposited On:06 Oct 2021 14:25
Last Modified:07 Oct 2021 06:59

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