Miospores from the type locality of the middle Famennian Esneux formation in the Ourthe valley, Eastern Belgium
1996
Loboziak, S. (Universite des sciences et technologies de Lille (France). Paleobotanique) | Avkhimovitch, V. | Streel, M.
At the type locality of the Esneux Formation, a 8 metres thick claystone interval is present in the upper part of the formation a few metres below nodular limestones of the Souverain-Pre Formation containing an early marginifera conodont fauna. Samples from the claystone contain an assemblage of miospores which can be referred to the early part of the (GF) gracilis-famenensis Zone which in the area underlines the late Famennian (VCo) versabilis-cornuta Zone. The early character of the GF Zone is shown by the occurrence in almost all the samples, of typical specimens of Grandispora famenensis (var. famenensis) and specimens with reduced ornamentation, identified as G. famenensis var. minuta in Byelorussia. This latter taxon is unknown in younger lithological formations in Belgium. The first occurrence of this last variety is found in the Cornispora varicornata assemblage-acme Zone of Byelorussia (base at the Eletz/Petrikov limit) the lower part of which is there correlated with the conodont rhomboidea Zone. The first occurrence of G. famenensis appears thus as a good marker for long distance correlation.
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