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LOWERMOST SILURIAN GRAPTOLITES OF MONTAGNE NOIRE, FRANCE

ABSTRACT-

Twenty-seven graptolite species are reported from the lowermost Silurian (Rhuddanian) ascensus-acuminatus and vesiculosus biozones of Montagne Noire in southwestern France. Four species are left in open nomenclature, four are new: Normalograptus crassus, Neodiplograptus lautus, D imorphograptus compactas and Huttagraptus solidus. The joint occurrence of Akidograptus ascensus, Parakidograptus acuminatus and Cystograptus ancestralis, recorded in the Gabian-1 section, suggests correlation of the whole succession at this site with the middle part of a combined ascensus-acuminatus Biozone. Revision of museum collections revealed that other elements that are characteristic of the ...

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