Chondrichthyan microremains from a section at Soureille d'Izarne (Montage Noire, southern France), with a new species,Thrinacodus tranquillus sp.n., are described and compared to several other late Famennian pelagic chondrichthyan assemblages.Three general chondrichthyan biofacies are distinguished: shallow water Protacrodus biofacie; intermediate Phoebodus-Thrinacodus biofacies, characteristic of moderately deep,open shelves; and deep water Jalodus biofacies The intermediate biofacies is the most widely distributed and usually yields the richest and most diverse assemblages
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