Palaeobiogeographic implications of the first report of the eocrinoid genus Ascocystites Barrande (Echinodermata, Blastozoa) in the Upper Ordovician of the Ougarta Range (Western Algeria)

Makhlouf, Yamouna; Nedjari, Ahmed; Dahoumane, Anissa; Nardin, Élise; Nohejlová, Martina; Lefèbvre, Bertrand

doi:10.1016/j.annpal.2018.07.001

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…Although abundant and diverse remains of eocrinoids were described in Cambrian and Lower Ordovician deposits of the Anti-Atlas (Chauvel 1971(Chauvel , 1978Chauvel & Régnault 1986;Smith et al 2013;Lefebvre et al 2016b;Allaire et al 2017), putative affinities of the two Late Ordovician taxa from the Tafilalt with earlier regional occurrences are impossible to identify in the absence of a welldefined phylogenetic framework for basal blastozoans. In Darriwilian-Katian times, Ascocystites was a relatively widespread genus in shallow settings of the Mediterranean Province: it was also described in Algeria (Ougarta; Makhlouf et al 2018) Rhombiferans. Rhombiferans are a polyphyletic assemblage of stemmed echinoderms that are locally abundant but exhibit low diversity in the Upper Ordovician rocks of the Anti-Atlas.…”

Section: Echinodermsmentioning

confidence: 99%

The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: a high-latitude perspective on the GOBE

Lefèbvre

Roy

Zamora

et al. 2022

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The extensive, predominantly siliciclastic deposits of the Upper Ordovician of the Tafilalt have long been the subject of scientific investigation. In the past 25 years, intensified collecting for commercial purposes has resulted in the discovery of several exceptionally-preserved faunas (Konservat-Lagerstätten) in the Tafilalt region, preserving a range of non-biomineralised and soft-bodied organisms. The preservation of these fossils in the coarse clastic sediments of the Tafilalt is surprising, and in the case of soft-bodied organisms, remarkably similar to the preservational mode of typical Ediacaran biotas. These relatively recent discoveries have increased the scientific significance of the Tafilalt Biota, providing an unparalleled insight into the composition and temporal evolution of the shallow, open-marine ecosystems and their denizens during the later stages of the Great Ordovician Biodiversification Event. At least nine different phyla, in addition to several soft-bodied problematica are represented in the Tafilalt. While the highly diverse and remarkably well-preserved echinoderm and euarthropod faunas are most emblematic for the Tafilalt Biota, further studies have revealed a relatively high diversity of molluscs and brachiopods. Among soft-bodied fossils, the problematic paropsonemid eldonids are iconic for the Tafilalt and stand out both through their abundance, and their wide temporal and geographic range throughout the area.

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Section: Echinodermsmentioning

confidence: 99%

The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: a high-latitude perspective on the GOBE

Lefèbvre

Roy

Zamora

et al. 2022

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Ichnological analysis of the Kheneg el Aatène Formation (Floian-Dapingian) at its type locality (Saoura Valley, Ougarta Range, southwestern Algeria)

Naimi,

Bouterfa,

Vinn

et al. 2023

Historical Biology

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The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact

Ghienne

Abdallah²,

Deschamps

et al. 2023

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The Ordovician of North and West Africa comprises three main transgressive-regressive sequences understood as ‘second-order’ cycles of 10-15 myr duration. Tide- to wave-dominated shallow-marine clastic successions, preserving incidental bryozoan carbonates to the north, include fluvial deposits over the most proximal southern stretches of the platform. The boundary with Cambrian strata remains unclear but the latter are progressively less represented to the south in the undifferentiated ‘Cambro-Ordovician’. To the north, graptolites, brachiopods and trilobites combined with palynomorphs, provide a robust biostratigraphic frame. Maximum flooding intervals occurred in the early to middle Tremadocian, mid-Darriwilian and middle to Late Katian. Two events interfered with an overall long-term transgressive trend. The ‘intra-Arenig’ (late Floian?) tectonic event highlighted palaeo-highs coinciding with Palaeoproterozoic basements. Gondwanan drainage basins were reorganized, which had an impact on sediment sourcing and distribution of detrital material (e.g. zircons) feeding the pre-Variscan Europe. The second event is the end-Ordovician glaciation. The domain supported the greatest part of the Hirnantian glaciers and may also have preserved pre-Hirnantian glacial archives. It is not until the very latest Ordovician that offshore conditions developed far inland; it is however suspected that this inundation benefited from a transient postglacial isostatic flexure.

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Palaeobiogeographic implications of the first report of the eocrinoid genus Ascocystites Barrande (Echinodermata, Blastozoa) in the Upper Ordovician of the Ougarta Range (Western Algeria)

Cited by 3 publications

References 12 publications

The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: a high-latitude perspective on the GOBE

The Late Ordovician Tafilalt Biota, Anti-Atlas, Morocco: a high-latitude perspective on the GOBE

Ichnological analysis of the Kheneg el Aatène Formation (Floian-Dapingian) at its type locality (Saoura Valley, Ougarta Range, southwestern Algeria)

The Ordovician record of North and West Africa: unravelling sea-level variations, Gondwana tectonics, and the glacial impact

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