Famennian rhynchonellides (Brachiopoda) from deep-water facies of the Ougarta Basin (Saoura Valley, Algeria)
2015
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 .
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