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| Grégoire, Ch.. |
| Remnants of decalcified nacreous layers from Ordovician, Devonian, Carboneferous (including Pennsylvanian), Permian, Jurassic and Cretaceous, nautiloid and ammonoid shells, examined in the electron microscope, consists of various, biuret-positive structures, which reflect degrees in degradation of the original conchiolon sheets. Identification of these structures as altered nacreous concholin and discrimination from contaminating structures of foreign organisms, a frequent finding in fossil shells, were based on detection of similar structural modifications in the Recent <i>Nautilus</i> shell, in well preserved shells of Pennsylvanian and Mesozoic cephalopods and in alterations produced artificially in experimental diagenesis of the Recent... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fossils; Paleozoic; Cephalopoda. |
| Ano: 1966 |
URL: http://www.vliz.be/imisdocs/publications/289080.pdf |
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