Trilobites and ichnofossils from a new fossil Lagerstätte in the Lower Cambrian Pardailhan Formation, southern Montagne Noire, France

Vizcaı̈no, Daniel; Álvaro, J. Javier; Monceret, Éric

doi:10.1016/j.geobios.2003.08.002

Cited by 12 publications

(17 citation statements)

References 9 publications

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“…The Vizcaïno, Alvaro & Monceret, 2004). The sandstone and dolostone beds were deposited in relatively high-energy shallow water, whereas the mudstone intercalations, from which bradoriids were recovered, may indicate a deeper depositional setting under quiet-water conditions (Vizcaïno, Alvaro & Monceret, 2004). The asterix indicates the level of the Pardailhan Formation within the Forêt des Soulanes de Nore sequence.…”

Section: Origin Of the Material Preservation And Terminology 2a Mamentioning

confidence: 99%

“…1). material comes from the Pardailhan Formation, a unit of between 50 and 250 m thickness, within the Lower Cambrian sequence (Alvaro, Debrenne & Vizcaïno, 2001;Vizcaïno, Alvaro & Monceret, 2004). The Vizcaïno, Alvaro & Monceret, 2004).…”

Section: Origin Of the Material Preservation And Terminology 2a Mamentioning

confidence: 99%

“…The sedimentology of the Pardailhan Formation is still poorly understood (Alvaro, Debrenne & Vizcaïno, 2001;Vizcaïno, Alvaro & Monceret, 2004), but the underlying Lastours Formation appears to have been deposited in shallow marine settings with periodic emergence (Alvaro, Debrenne & Vizcaïno, 2001). The common occurrence of carbonate bioherms in the Pardailhan Formation probably suggests a relatively shallow marine shelf setting, though the bradoriids are sourced from mudstones that may have been deposited in slightly deeper carbonate-poor settings.…”

Section: A Habitatmentioning

confidence: 99%

“…Much of the Lower Cambrian rock sequence of the Montagne Noire, southern France, is fossil poor (Alvaro, Debrenne & Vizcaïno, 2001), but at certain horizons within the sequence, particularly within the Pardailhan Formation, there are relatively rich assemblages of bivalved arthropods including bradoriids and Isoxys, trilobites (ellipsocephalids, redlichiids, abadiellids), inarticulate brachiopods, hyolithids, sponge spicules, chancelloriid sclerites, ichnofossils and possible arthropod appendages (see Vizcaïno, Alvaro & Monceret, 2004 for faunal inventory). These provide evidence about the biodiversity of Cambrian assemblages living on the margins of the Gondwana palaeocontinent (Alvaro, Debrenne & Vizcaïno, 2001).…”

Section: Introductionmentioning

confidence: 99%

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New Early Cambrian bivalved arthropods from southern France

et al. 2005

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International audienceThe Lower Cambrian Pardailhan Formation of the Montagne Noire (Southern France) has yielded a diverse fossil assemblage including bivalved arthropods (the bradoriids Monceretia erisylvia gen. et sp. nov., Cambria danvizcainia sp. nov. and Matthoria? sp., together with Isoxys sp.) associated with trilobites, hyolithids, inarticulate brachiopods, sponge spicules, ichnofossils and chancelloriid sclerites. This assemblage provides new evidence about the biodiversity of Early Cambrian marine communities in palaeocontinentalGondwana. The bradoriids are Cambriidae, a familywith widespread distribution in offshore shelf marine environments during Early Cambrian times. The present study confirms the presence of cambriids within a subtropical latitudinal belt that encompasses Laurentia, Siberia and the Gondwanan margins from Southern France to South China. Although knowledge of the distribution of fossil cambriids is patchy, at the generic level they appear to be provincial, with Petrianna from Laurentia, Shangsiella and Auriculatella from South China, Cambria from Siberia and Gondwana (Armorica), and Monceretia gen nov. from Gondwana (Armorica). The presence of Isoxys in the Montagne-Noire confirms the cosmopolitan distribution of this genus in the Early and Middle Cambrian tropics. Cambriid bradoriids occupy a biostratigraphically narrow time interval, probably equating to part of the Atdabanian and Botomian stages of Russian terminology. Their presence in the Pardailhan Formation supports the notion of a Botomian age, determined from archaeocyathan evidence. The North American bradoriid genus Matthoria, also possibly present in the Pardailhan Formation, is reassigned to the Cambriidae

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Section: Origin Of the Material Preservation And Terminology 2a Mamentioning

confidence: 99%

Section: Origin Of the Material Preservation And Terminology 2a Mamentioning

confidence: 99%

Section: A Habitatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Early Cambrian bivalved arthropods from southern France

et al. 2005

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“…The presence and distribution of carbonates allow definition of the Cambrian Epoch 2 Pardailhan and Lastours formations, where microbial-archaeocyathan reefs, ooidal shoals, and peritidal substrates are common (Álvaro et al , Debrenne et al 2002. Konservat-Lagerstätten are known from the shale interbeds of the Pardailhan Formation, which have yielded remarkable soft-part preservation of arthropods (including bradoriids), sponges, chancelloriid cuticles, and trilobites (Vizcaïno et al 2004, Vannier et al 2005, Monceret & Monceret 2007. Evaporitic cauliflower-like nodules of anhydrite/gypsum occur in the upper member of the Lastours Formation, preserved within silica nodules and related to episodic subaerial exposure (Álvaro et al 2000a).…”

Section: Montagne Noirementioning

confidence: 99%

Stratigraphic record and palaeogeographic context of the Cambrian Epoch 2 subtropical carbonate platforms and their basinal counterparts inSW Europe, West Gondwana

Álvaro¹,

Monceret²,

Monceret³

et al. 2010

Bull. Geosci.

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The Ibero-Armorican Arc is the main Variscan macrostructure inSWEurope. Its branches preserve the Cambrian record of a continuous margin of West Gondwana, from its southwestern edge (West Asturian-Leonese and Cantabrian zones and their lateral continuity into the Iberian Chains) to its northeastern extension (basement of the Cenozoic Aquitaine basin, Montagne Noire, southern Cévennes, and Sardinia). These Variscan relics allow the reconstruction of a Cambrian Epoch 2 carbonate belt that developed intermittently along West Gondwana. Facies associations show that the main centres of carbonate productivity were nucleated in ooidal and sand shoals, together with microbial and microbial- archaeocyathan reefs, developed in high energy regimes under subtropical arid conditions. Outside the inner carbonate belt, carbonate production was episodic and related to deposition of kerogenous black shales and phosphogenesis in the Central Iberian Zone and northern parts of Montagne Noire and Cévennes. Development of carbonate platforms along the margin was diachronous and discontinuous, due to poleward drifting and tectonically induced drowning and flooding. Biogeographic connection with similar subtropical carbonate platforms from East Gondwana (mainly South China) favoured the migration of equatorial and subtropical trilobite genera, such as Dolerolenus, Eoredlichia, Metaredlichia, Protolenus, Redlichia, and Sardaspis

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