Les silex fossilifères (invertébrés marins et plantes terrestres) du Crétacé supérieur de Claix (Charente)

Moreau, Jean-David; Néraudeau, Didier; Platel, Jean-Pierre; Ravon, Anne-Lyse

doi:10.1016/j.annpal.2016.05.003

Cited by 8 publications

(13 citation statements)

References 23 publications

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“…in press and in contrast to the extended Eocene silicification episode(s) adduced by Moreau et al . (, b, ) and Néraudeau (). Since the shell was primarily composed of calcite and completely permineralized in silica, carbonates dissolved before or at the time of silicification.…”

Section: Resultsmentioning

confidence: 99%

The oldest shipworms (Bivalvia, Pholadoidea, Teredinidae) preserved with soft parts (western France): insights into the fossil record and evolution of Pholadoidea

et al. 2018

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Teredinidae are obligate xylophagous bivalves that colonize drift wood. They display a highly derived anatomy with a reduced shell; most of their body consists of soft tissues. Consequently, fossil teredinids mostly correspond to burrows, shells or small terminal aragonite structures called ‘pallets’. We report, from mid‐Cretaceous logs of the Envigne Valley, France, exceptionally preserved wood‐boring bivalves with silicified soft parts. After characterizing the wood, we report both the molluscs’ anatomy and their distribution inside the wood (using computed tomography). The 3D‐reconstructions reveal rarely preserved soft tissues (mantle, respiratory siphons, visceral pouch) but surprisingly no mineralized pallets. Envigne shipworms display neat dorsal condyles and a vermiform body plan, making them the oldest known Teredinidae. To document the evolutionary or taphonomic origin of this lack of pallet, the mineralization of these bivalves was investigated, and it is concluded that pallets could have dissolved prior to other carbonate components. From a survey of the fossil wood‐boring bivalves and their characters, we provide a time scaled origin of the main pholadoid clades supported in recent phylogenies. Since we found no correlation between the presence of pallets in Pholadoidea and their occurrence in the stratigraphic record, we suggest that their absence during the Mesozoic could be the result of a taphonomic bias related to the ‘calcite vs aragonite seas’ paradigm. The Cenomanian Envigne Valley was an estuarine to intertidal environment in which the Teredinidae appear to have selected their wood habitat on the basis of size but not type.

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Section: Resultsmentioning

confidence: 99%

The oldest shipworms (Bivalvia, Pholadoidea, Teredinidae) preserved with soft parts (western France): insights into the fossil record and evolution of Pholadoidea

et al. 2018

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“…Preliminary inventories of silicified plant megafossils have been previously reported from the upper Turonian or lower Coniacian of Claix and Torsac, Charente, western France (Néraudeau 2014; Moreau et al . 2016). However, the descriptions and pictures provided in these studies do not allow for accurate identifications.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, Néraudeau (2014) and Moreau et al . (2014a, b, 2016) suggested that the plant-fossil-bearing flints in western France were mostly, if not all, secondarily formed by leaching of upper Cretaceous rocks during warm climatic maxima of the Palaeogene, and especially of the Eocene, so that the silicification episode or episodes occurred up to 44 million years later. Néraudeau (2014) and Moreau et al .…”

Section: Discussionmentioning

confidence: 99%

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Silicified plant megafossils from the upper Turonian of Vienne, western France

Gómez¹,

Daviero‐Gomez²,

Garcia

et al. 2017

Earth and Environmental Science Transactions of the Royal Socie

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A new locality with silicified permineralised plant megafossils is reported from the upper Turonian of Colombiers, Vienne, western France. The plant fossil assemblage consists of Geinitzia reichenbachii (Geinitz) Hollick et Jeffrey and ‘Lomatopteris' superstes Saporta. Whilst G. reichenbachii is a worldwide widespread Cretaceous conifer, ‘L.' superstes is reported in western France for the first time. The latter fossil shows bipinnately compound leaf, marginal teeth, one thick primary vein, pinnate secondary veins and faint, reticulate, narrower veins. Besides its fern-like gross morphology, these characters indicate that it most likely belongs to angiosperms and eudicots. The formation of silicified nodules bearing such fossils from the Cenomanian to the Coniacian of western France was previously attributed to the secondary silicification of limestones during Cenozoic climatic weathering episodes. However, based on both petrography and preservation evidence, we demonstrate that it was an endogenic process contemporaneous to the earliest stages of fossil diagenesis created by palaeoenvironmental and climatic conditions.

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“…In France, whereas Cretaceous marine invertebrates (brachiopods, bivalves, bryozoans, echinoids, sponges) are common inside flint from alterites (e.g., Néraudeau 2004Néraudeau , 2011Caux, 2015), terrestrial floras remain extremely rare. Over the last decades, alterites containing fossiliferous flints with Upper Cretaceous plant macroremains were discovered from few localities in western France: the Font-Benon quarries in Charente-Maritime (Moreau et al, 2014a); Claix and Torsac in Charente (Néraudeau, 2014;Moreau et al, 2016); and three areas around Châtellerault in Vienne (Moreau et al, 2018). By contrast with most of Cretaceous plant beds from western France which preserved foliar remains as impressions or compressions with or without cuticle (e.g., Lecointre and Carpentier, 1938;Alvarez-Ramis et al, 1981;Berthelin and Pons, 1999;Néraudeau et al, 2005Néraudeau et al, , 2012Saint-Martin et al, 2013;Valentin et al, 2014), flints may contain exquisite siliceous preservations of the plant macroremains up to the cell levels.…”

Section: Introductionmentioning

confidence: 99%

Exceptional preservation of Cretaceous biota (plants and invertebrates) in flint-bearing alterites from Moragne (western France)

Moreau

Néraudeau

Benoit

et al. 2019

Palaeontol Electron

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Les silex fossilifères (invertébrés marins et plantes terrestres) du Crétacé supérieur de Claix (Charente)

Cited by 8 publications

References 23 publications

The oldest shipworms (Bivalvia, Pholadoidea, Teredinidae) preserved with soft parts (western France): insights into the fossil record and evolution of Pholadoidea

The oldest shipworms (Bivalvia, Pholadoidea, Teredinidae) preserved with soft parts (western France): insights into the fossil record and evolution of Pholadoidea

Silicified plant megafossils from the upper Turonian of Vienne, western France

Exceptional preservation of Cretaceous biota (plants and invertebrates) in flint-bearing alterites from Moragne (western France)

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