Morphological disparity and systematic revision of the eocrinoid genus<i>Rhopalocystis</i>(Echinodermata, Blastozoa) from the Lower Ordovician of the central Anti-Atlas (Morocco)

Allaire, Ninon; Lefèbvre, Bertrand; Nardin, Élise; Martin, Emmanuel L.O.; Vaucher, Romain; Escarguel, Gilles

doi:10.1017/jpa.2017.6

Cited by 13 publications

(28 citation statements)

References 30 publications

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“…sinuosus , Paleosphaeronites sp., Rhopalocystis destombesi, R. zagoraensis ; Ubaghs ; Chauvel , , ; Chauvel & Régnault ; Allaire et al . , ); and an upper level (~380 m) with Clonograptus flexilis and C. rigidus . Destombes () considered the two lower graptolite assemblages as typical of the late Tremadocian, and the uppermost one as close to the Tremadocian–Floian boundary.…”

Section: Age Calibration Of the Lower Interval With Exceptional Presementioning

confidence: 99%

“…The intermediate graptolite locality (~280 m) appears to be located within the lower interval with exceptional preservation (localities 809, 1157, 1725 in Destombes ; see also Allaire et al . , ; Lefebvre et al . ).…”

Section: Age Calibration Of the Lower Interval With Exceptional Presementioning

confidence: 99%

“…Balantiocystis regnelli, Rhopalocystis destombesi : Allaire et al . , ), rhombiferans ( Macrocystella bohemica : Chauvel ), somasteroids, solutans ( Plasiacystis mobilis : Lefebvre et al . ) and stylophorans (e.g.…”

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. 1;Vidal 1998b;Vaucher et al 2016Vaucher et al , 2017. A Floian age is traditionally assigned to the upper part of the Fezouata Shale, based on its trilobite and graptolite assemblages (Destombes 1962(Destombes , 1967(Destombes , 1971Destombes et al 1985;Vidal 1998a,b).…”

mentioning

confidence: 96%

“…In spite of recent major advances related to the description of some exceptionally preserved taxa (Botting 2007;Vinther et al 2008Vinther et al , 2017Van Roy & Briggs 2011;Van Roy et al 2015b;Ortega-Hern andez et al 2016), the associated environmental conditions (Martin et al 2016a;Vaucher et al 2016Vaucher et al , 2017, and some preliminary taphonomic investigations (Gaines et al 2012;Allaire et al 2015;Martin et al 2015), the analysis of the Fezouata Biota remains at an early stage, and many points still need to be clarified. One of these major issues concerns the precise age and stratigraphical extent of the Fezouata Biota.…”

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confidence: 99%

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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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Section: Age Calibration Of the Lower Interval With Exceptional Presementioning

confidence: 99%

Section: Age Calibration Of the Lower Interval With Exceptional Presementioning

confidence: 99%

Section: Age Calibration Of the Upper Interval With Exceptional Presementioning

confidence: 99%

mentioning

confidence: 96%