Le modèle des biofaciès à Trilobites: un test dans l'Ordovicien inférieur de l'Anti-Atlas, Maroc

Vidal, Muriel

doi:10.1016/s1251-8050(98)80051-7

Cited by 15 publications

(29 citation statements)

References 3 publications

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“…In South Wales, the Floian bivalves described by Cope () form a major part of a mollusc‐dominated fauna in the earliest “modern fauna” ( sensu Sepkoski, ) yet known, and occur in a shallow marine inshore environment, whereas in eastern Alborz, the bivalves occur as a minor component of a trilobite‐dominated fauna of the outer shelf. The most common trilobite taxon is Damghanampyx ginteri Ghobadi Pour et al, , suggesting attribution to the raphiophorid biofacies, which proliferated between the distal part of the upper offshore and the proximal part of the lower offshore according to Vidal (). In this respect, the Alborz bivalve fauna resembles that of the Montagne Noire where the bivalves occur in a deeper water shaley facies with trilobites and graptolites (Babin, ).…”

Section: Geological and Geographical Settingmentioning

confidence: 99%

An Early Ordovician (late Tremadocian) bivalve fauna from Iran

Cope

Pour

2019

Geological Journal

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Section: Geological and Geographical Settingmentioning

confidence: 99%

An Early Ordovician (late Tremadocian) bivalve fauna from Iran

Cope

Pour

2019

Geological Journal

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“…). Vidal (, ) produced the first systematic descriptions of several new trilobite taxa (e.g. Ampyx cf.…”

Section: Age Calibration Of the Upper Interval With Exceptional Presementioning

confidence: 99%

“…The transition with the sandstones of the overlying Zini Formation is indeed very gradual and corresponds to a clear regressive trend (Fig. ; Vidal ; Vaucher et al . , ).…”

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confidence: 91%

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Age calibration of the Lower Ordovician Fezouata Lagerstätte, Morocco

Lefèbvre

Gutiérrez-Marco

Lehnert

et al. 2018

LET

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The Fezouata Lagerstätte, discovered in the Lower Ordovician rocks of Morocco, is a Konservat‐Lagerstätte of prime scientific importance. It provides access not only to the ‘shelly’ (skeletonized) part of its fossil assemblages, but also to non‐biomineralized to lightly sclerotized organisms and to exceptionally preserved soft tissues of a complex ecosystem, mixing elements of both the ‘Cambrian Explosion’ and the ‘Great Ordovician Biodiversification Event’ (GOBE). The Fezouata Lagerstätte occurs at different intervals in the Fezouata Shale, a formation ranging from the lower Tremadocian to the upper Floian (Lower Ordovician). In spite of recent major advances in the detailed biostratigraphy of the Fezouata Shale, there is currently no consensus on the precise age of the fossiliferous levels yielding exceptionally preserved assemblages. Consequently, all available biostratigraphical evidence based on several fossil groups is here critically reviewed and discussed. It can be concluded that exceptional preservation is restricted to a few thin, discontinuous, lens‐shaped horizons occurring in two distinct parts of the Fezouata Shale: a lower interval (260–330 m above the base of the formation) and an upper interval (570–620 m). Integrated biostratigraphical studies, essentially based on investigations of graptolites, acritarchs and conodonts, indicate that the lower interval can be correlated with the upper Tremadocian, whereas the upper interval corresponds to the middle Floian.

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“…Several trilobite biozones have been proposed for the Floian of Montagne Noire, which exhibits transgressive–regressive trends reaching the Neseuretus biofacies of inshore environments (Vizcaïno & Álvaro ). In the Fezouata Formation of Morocco, there is a general regressive trend among the Arenigian trilobite assemblages, from the raphiophorid to Colpocoryphe and Neseuretus biofacies, with many taxa in common with the Montagne Noire (Vidal ,b; Martin et al . ).…”

Section: The Bohemo‐iberian Regional Scalementioning

confidence: 99%

The Bohemo‐Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana

Gutiérrez-Marco

Sá

García‐Bellido

et al. 2017

LET

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The Bohemo‐Iberian regional scale for South Gondwana, involving the ‘Mediterranean Province’, comprises five regional stages (Arenigian, Oretanian, Dobrotivian, Berounian and Kralodvorian) plus the global Tremadocian and Hirnantian. The predominance of shallow‐water taxa in those high‐latitude faunas imposes serious difficulties for correlating the regional succession with the formal global chronostratigraphy because of the almost total absence of the key graptolites and conodonts defining the base of the standard series, stages and stage slices. Instead, the abundant benthic faunas (trilobites, brachiopods, molluscs, echinoderms) of South Gondwanan origin largely dominated in the area from the middle Darriwilian to the late Katian. The poleward faunal migration of originally Avalonian, Baltic, Laurentian and even Asiatic taxa during the Boda Event of global warming progressively ends with the endemicity in the region, where the ensuing benthic assemblages were severely affected by the Hirnantian glaciation. The regional scale significantly improves the precision of correlations between Ordovician strata from SW and central Europe, North Africa and a large part of the Middle East. An updated record of palaeontological data from areas where Mediterranean faunas remain practically unknown, or are still poorly investigated, is also included. Palaeobiogeographical relationships based on the distribution of faunas across South Gondwana are suggested as an improvement for positioning many territories in modern palaeogeographical reconstructions and offer a constructive approach to problems related to the pre‐Variscan and pre‐Alpine orogenic puzzles.

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Le modèle des biofaciès à Trilobites: un test dans l'Ordovicien inférieur de l'Anti-Atlas, Maroc

Cited by 15 publications

References 3 publications

An Early Ordovician (late Tremadocian) bivalve fauna from Iran

An Early Ordovician (late Tremadocian) bivalve fauna from Iran

Age calibration of the Lower Ordovician Fezouata Lagerstätte, Morocco

The Bohemo‐Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana

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