Le passage Ordovicien–Silurien et la partie inférieure du Silurien (Sud-Est du Massif armoricain, France)The Ordovician–Silurian transition and the lower part of the Silurian (southeastern Armorican Massif, France) |
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| Authors: | Jos Manuel Piarra Michel Robardet Ahmed Bourahrouh Florentin Paris Zlia Pereira Jean Le
Menn Rmy Gourvennec Toms Oliveira Hubert Lardeux |
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| Institution: | José Manuel Piçarra, Michel Robardet, Ahmed Bourahrouh, Florentin Paris, Zélia Pereira, Jean Le Menn, Rémy Gourvennec, Tomás Oliveira,Hubert Lardeux |
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| Abstract: | A new section in the Silurian graptolitic ‘phtanites’ (black cherts) of Les Fresnaies at Chalonnes-sur-Loire (SE Armorican Massif) shows for the first time that these rocks (1) succeed conformably to Uppermost Ordovician (Hirnantian) glaciomarine deposits and (2) contain successive graptolite assemblages that characterise the base of the Silurian, the whole Rhuddanian and Aeronian stages and the lower part of the Telychian. To cite this article: J.M. Piçarra et al., C. R. Geoscience 334 (2002) 1177–1183. |
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