New occurrences of the wood Protocupressinoxylon purbeckensis Francis: implications for terrestrial biomes in southwestern Europe at the Jurassic/Cretaceous boundary |
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Authors: | by MARC PHILIPPE JEAN-PAUL BILLON-BRUYAT† JOSE C GARCIA-RAMOS‡ LOÏC BOCAT† BERNARD GOMEZ LAURA PIÑUELA‡ |
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Institution: | UMR5125 CNRS, UniversitéLyon1 (Campus de la Doua, Darwin A), 69622 Villeurbanne Cedex, France;e-mails;; Section d'archéologie et paléontologie, OCC, Hôtel des Halles, CH-2900 Porrentruy, Switzerland;e-mails;; Departamento de Geologia. Universidad de Oviedo, C/Jesus Arias de Velasco s/n. 33005 Oviedo and Museo del Jurásico de Asturias (MUJA), 33328 Colunga, Spain;e-mails; |
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Abstract: | Abstract: Previously known from the Kimmeridgian–Portlandian of Dorset (UK) only, Protocupressinoxylon purbeckensis wood is reported here from the Kimmeridgian of Asturias (Spain) and Ajoie (Switzerland). The morphospecies taxonomy and nomenclature are discussed, and new supplementary illustrations are given. The P. purbeckensis tree was growing in dry strongly seasonal (tropophilous) environments, and the new occurrences suggest that such a climate prevailed on land all over southwestern Europe at the end of the Jurassic (Kimmeridgian sensu anglico – Portlandian). The review of fossil wood data indicates that such a stressful environment may have constrained terrestrial biocoenoses and their evolution at the Jurassic/Cretaceous boundary. But wood generic diversity curves are also strikingly similar to that drawn 20 years ago for nonmarine tetrapods, implying a fossil Lagerstätte effect. |
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Keywords: | Jurassic Cretaceous boundary fossil wood palaeoecology southwestern Europe |
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