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Geological Society, London, Special Publications; 2007; v. 278; p. 261-271;
DOI: 10.1144/SP278.12
© 2007 Geological Society of London

Articles

Brachiopod faunal changes across the Devonian–Carboniferous boundary in NW Sahara (Morocco, Algeria)

D. Brice1,2, M. Legrand-Blain3 & J.-P. Nicollin1,2

1 Laboratoire de Paléontologie stratigraphique, Faculté Libre des Sciences et Technologies, 41 rue du Port, 59046 Lille Cedex, France
2 Institut Supérieur d'Agriculture, 48 boulevard Vauban, 59046 Lille Cedex, France(e-mail: d.brice{at}isa-lille.fr, jp.nicollin{at}isa-lille.fr)
3 ‘Tauzia’, Cours Général de Gaulle, 33170 Gradignan, France (e-mail: legrandblain{at}wanadoo.fr)

Based on previous systematic studies of productid, rhynchonellid and spiriferid brachiopods from NW Sahara (Morocco and Algeria), we recognize three successive faunas near the Devonian–Carboniferous boundary. A ‘Lower Fauna’, late Famennian in age [IV(?)-V and lower VI(?) Zones], and an ‘Upper Fauna’, early Tournaisian in age, are present in southern Morocco (Assa, Akka, Zemoul areas) and in Algeria, Timimoun area. A third ‘Intermediate Fauna’, with few taxa, and differing according to the areas, is identified in southern Morocco. Northwards, in Tafilalt–Ma'der basins, rare brachiopods, found above a ‘Hangenberg Black Shale’ equivalent, are in spite of taxonomic differences related to the ‘Upper Fauna’. This important renewal of faunas could be in relation to the main lithological variations.