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Poster De Conférence Année : 2018

Sclerochronological study on ammonoid jaws

Résumé

Sclerochonological studies carried out on Recent and fossil mollusks provide a methodological framework that could be applied to ammonite lower jaws. As a challenge for macroevolutionary studies, age estimations based on growth features and chemical compositions of the low Sr aragonitic outer shell have been attempted on few exceptionally preserved specimens, but remain questionable. Compared to the aragonitic shell, the calcitic covering of the lower jaw (called aptychus) is poorly investigated although in Recent cephalopods, chitinous beaks are considered relevant proxies for the age of the animal.Following these studies, well-preserved aptychi from the Campanian of Alabama (Mooreville Chalk) were investigated to assess their potential for sclerochonological studies. We analyzed growth lines spacing, microstructure, and variation of the chemical composition along the growth direction (∂18O) and trace elements. Microstructural observations indicate that fine growth features (up to 2 μm thick) are well preserved and that a part of paleobiological information is preserved

Domaines

Paléontologie
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Dates et versions

hal-03319175 , version 1 (11-08-2021)

Identifiants

  • HAL Id : hal-03319175 , version 1

Citer

Isabelle Rouget, Isabelle Kruta, Vincent Mouchi, Pazzé Léo, Yannnicke Dauphin, et al.. Sclerochronological study on ammonoid jaws. GSA Annual Meeting in Indianapolis, Indiana, USA - 2018, Nov 2018, Indianapolis, United States. ⟨hal-03319175⟩
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