Early Carboniferous ammonoid faunas and stratigraphy of the Montagne Noire (France)

Abstract

The early Carboniferous (Mississippian) sedimentary succession of the Montagne Noire is subdivided into three major lithostratigraphic units, in ascending order the Montagne Noire Griotte Group (Devonian to Early Tournaisian), the Tournaisian to Visean Saint-Nazaire Group (with the Lydiennes, Faugeres, Colonnes, and Puech Capel Formations, the latter new), and the Laurens Flysch Group (late Vise an). The ammonoid assemblages in these rock units are reviewed. A total of 29 Early Carboniferous ammonoid taxa at species level are determined. The new genus Nigrocyclus n. gen., and the new species Gattendorfia nazairensis n. sp., Globimitoceras albaillei n. sp., and Neogoniatites canovasi n. sp. are described.