Geologica Belgica

1374-8505 2034-1954

 

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Julien DENAYER, Edouard POTY, Jean-Marc MARION & Bernard MOTTEQUIN

Lower and Middle Famennian (Upper Devonian) rugose corals from southern Belgium and northern France

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Mots-clés : Tabulata, Cyathaxonia fauna, Rugosa, Breviphrentis, post-extinction diversification.

Abstract

After the late Frasnian extinctions, the rugose corals slowly recovered during the Lower and Middle Famennian (crepida to marginifera conodont zones) in southern Belgium and northern France (Avesnois) (Namur–Dinant Basin). Six genera represented by seven species are recognized and described here; one species (Breviphrentis superstes) is new. The rugose coral fauna described herein includes small solitary forms belonging to the so-called Cyathaxonia fauna and is similar or very close to those previously described within the same stratigraphic interval in Australia, China and Germany. It also contains a large species belonging to the genus Breviphrentis which was considered as extinct since the end of the Givetian (Middle Devonian) (“Lazarus taxon”). The tabulate corals from the Lower and Middle Famennian of this area, mainly represented by auloporids, are also briefly discussed. Rugosa only constituted a minor part of the fauna after the end-Frasnian crisis in the Namur–Dinant Basin contrary to the brachiopods, which were abundant and relatively diversified, and no rugose corals have been recovered from the early Lower Famennian (triangularis Zone). The first important Famennian coral radiation only took place during the Latest Famennian (Strunian).

Para citar este artículo

Julien DENAYER, Edouard POTY, Jean-Marc MARION & Bernard MOTTEQUIN, «Lower and Middle Famennian (Upper Devonian) rugose corals from southern Belgium and northern France», Geologica Belgica [En ligne], volume 15 (2012), number 4 - Proceedings of the XIth International Symposium on Fossil Cnidaria and Porifera, 273-284 URL : https://popups.ulg.ac.be/1374-8505/index.php?id=3773.

Acerca de: Julien DENAYER

Unité de paléontologie animale et humaine, Université de Liège, Bât. B18, Allée du 6 Août, B-4000 Liège, Belgium; julien.denayer@ulg.ac.be

Acerca de: Edouard POTY

Unité de paléontologie animale et humaine, Université de Liège, Bât. B18, Allée du 6 Août, B-4000 Liège, Belgium; e.poty@ulg.ac.be

Acerca de: Jean-Marc MARION

Unité de paléontologie animale et humaine, Université de Liège, Bât. B18, Allée du 6 Août, B-4000 Liège, Belgium; jmmarion@ulg.ac.be

Acerca de: Bernard MOTTEQUIN

Unité de paléontologie animale et humaine, Université de Liège, Bât. B18, Allée du 6 Août, B-4000 Liège, Belgium; bmottequin@ulg.ac.be