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Famennian rhynchonellides (Brachiopoda) from deep-water facies of the Ougarta Basin (Saoura Valley, Algeria)

Published online by Cambridge University Press:  10 April 2015

BERNARD MOTTEQUIN ,
FATIMA ZOHRA MALTI ,
MADANI BENYOUCEF ,
CATHERINE CRÔNIER ,
LOUISA SAMAR ,
CARINE RANDON  and
DENISE BRICE
BERNARD MOTTEQUIN*
Affiliation:
Institut Royal des Sciences Naturelles de Belgique, D. O. Terre et Histoire de la Vie, rue Vautier 29, B 1000 Brussels, Belgium
FATIMA ZOHRA MALTI
Affiliation:
Université de Béchar, Faculté des Sciences et de la Technologie, BP 417, Béchar 08000, Algeria
MADANI BENYOUCEF
Affiliation:
Université de Mascara, Département des Sciences de la Terre, BP 305, Mascara 29000, Algeria
CATHERINE CRÔNIER
Affiliation:
FRE 3298, Géosystèmes, Université Lille 1, Sciences de la Terre, 59655 Villeneuve d’Ascq Cedex, France
LOUISA SAMAR
Affiliation:
SONATRACH, Centre de Recherche et Développement, Boumerdès 35000, Algeria
CARINE RANDON
Affiliation:
UMR 7207 CR2P Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, Université Pierre et Marie Curie, Laboratoire de Micropaléontologie, 75252 Paris Cedex 05, France
DENISE BRICE
Affiliation:
Université Catholique de Lille et Groupe ISA 48 boulevard Vauban, 59046 Lille Cedex, France
*
*Author for correspondence: [email protected]
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Abstract

In the Saoura Valley (Ougarta Basin, Saharan Algeria), the lower–upper Famennian part of the essentially shally Marhouma Formation is characterized by deep-water facies and includes horizons rich in ammonoids (goniatites and clymeniids) and blind to eye-reduced phacopide trilobites. They are also rich in small-sized and smooth rhynchonellide brachiopods, investigated here for the first time in order to detail their post-Kellwasser recovery. Rhynchonellides clearly predominate in the brachiopod assemblages (representing 90% of the whole assemblage, with 10 species) composed otherwise of athyridides, orthides and spiriferides. Rhynchonellides are mostly represented by relatively flat leiorhynchids and rozmanariids consistent with poor oxygenation on the sea floor. One new species is described (Evanidisinurostrum saouraense sp. nov.); four genera, previously known only from the south-eastern margin of Laurussia, are reported for the first time from the northern margin of Gondwana: the leiorhynchid Sphaeridiorhynchus and the rozmanariids Leptoterorhynchus, Pugnaria and Novaplatirostrum.

Keywords

Upper DevonianMarhouma FormationNorth GondwanabrachiopodsRhynchonellidapalaeoecology
Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 6 , November 2015 , pp. 1009 - 1024
Copyright
Copyright © Cambridge University Press 2015 

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