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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Stratigraphy of Special Areas
Le Devonien du Domaine Nord-Pyreneen Oriental
Abstract
The Devonian is well represented in the south of France; specifically in the Black Mountains, Mouthoumet Massif and Eastern Pyrenees. Although locally it is in complete sedimentary continuity with the Upper Silurian, elsewhere it oversteps older beds right down to the Ordovician. In spite of this, conglomerates and basal sandstones are rather rare. Above the basal layers the Lower Devonian is essentially in a limestone-dolomite facies and ends with an excellent marker horizon of “Lydian Stones” (flints-Trans.) — which, according to microfaunal evidence, is already within the base of the Middle Devonian — together with tuffs indicating a distant volcanism. The Middle Devonian, comprising limestones and marls, begins to show various very localized facies of emersion in the middle of a sea containing scattered “reefs” of corals and algae. The Upper Devonian, which is composed of marly limestones towards the base, contains a marker bed characterized by tuffs, ferruginous or ferromanganous nodules, scattered chert nodules and locally some very fine horizons of Lydian Stones. In the upper part the series consists principally of limestones of the type known as “Griotte”, in which indications of emersion are common, and locally ends with a lenticular dolomite facies. The faunas go up as far as Zone II of the Famennian and the next fauna found above this is Upper Tournaisian. Many other criteria also seem to indicate a more or less important emersion towards the Devono-Carboniferous boundary.
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