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

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 ri...

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Bibliographic Details
Published in:Geological magazine 2015-11, Vol.152 (6), p.1009-1024
Main Authors: Mottequin, Bernard, Malti, Fatima Zohra, Benyoucef, Madani, Crônier, Catherine, Samar, Louisa, Randon, Carine, Brice, Denise
Format: Article
Language:English
Subjects:
Africa
Algeria
Ammonoidea
Articulata
basin analysis
basins
biofacies
Brachiopoda
Deep water
deep-water environment
depositional environment
Devonian
Earth Sciences
Evanidisinurostrum
Famennian
faunal studies
Fossils
Geological time
Geology
Gondwana
Invertebrata
invertebrate
Leptoterorhynchus
Marhouma Formation
Marine
marine environment
morphology
new taxa
North Africa
northern Gondwana
Novaplatirostrum
Ocean floor
Ougarta Basin
Oxygenation
paleoecology
paleoenvironment
paleogeography
Paleontology
Paleozoic
Pugnaria
Rhynchonellida
Rhynchonellidae
Sahara
Saoura Valley
Sciences of the Universe
sedimentary basins
shells
Sphaeridiophynchus
Stratigraphy
taxonomy
Trilobita
Upper Devonian
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Summary: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.
ISSN:0016-7568
1469-5081
DOI:10.1017/S0016756814000697