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Communication Dans Un Congrès Année : 2020

Insights into soft-part preservation from the Early Ordovician Fezouata Biota

Farid Saleh
  • Fonction : Auteur
Romain Vaucher
Jonathan B Antcliffe
  • Fonction : Auteur
Allison C Daley
  • Fonction : Auteur
Khadija El Hariri
  • Fonction : Auteur
Khaoula Kouraiss
  • Fonction : Auteur
Emmanuel L O Martin
  • Fonction : Auteur
Jean-Philippe Perrillat
Pierre Sansjofre
  • Fonction : Auteur
Muriel Vidal
  • Fonction : Auteur
Bernard Pittet
  • Fonction : Auteur

Résumé

The Fezouata Biota in Morocco is the only Lower Ordovician Lagerstätte yielding a biologically diverse assemblage in a fully marine environment, whilst also containing organisms typical of Cambrian Burgess Shale-type (BST) ecosystems. Fossils from the Fezouata Shale share the same mode of preservation as Cambrian BST biotas defined by carbonaceous compressions and accessory authigenic mineralization. Most organisms of the Fezouata Biota were already dead and decaying on the seafloor when they were buried in situ by occasional storm deposits in a distal facies. Pre-burial decay in the Fezouata Shale was responsible for the non-preservation of completely cellular organisms such as jellyfish. These conditions contrast with the processes described for soft-tissue preservation in the Burgess Shale (Canada) and the Chengjiang biota (China). In these two Cambrian Lagerstätten, animals were transported alive or shortly after death by obrution events to a facies that was favourable for preservation. Despite preservational biases, the autochthonous assemblages of the Fezouata Shale offer a unique opportunity to decipher the structure of in situ communities and ecological dynamics in Early Palaeozoic seas, when compared to the allochthonous communities of most Cambrian BST biotas
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Dates et versions

hal-03431869 , version 1 (16-11-2021)

Identifiants

  • HAL Id : hal-03431869 , version 1

Citer

Farid Saleh, Romain Vaucher, Jonathan B Antcliffe, Allison C Daley, Khadija El Hariri, et al.. Insights into soft-part preservation from the Early Ordovician Fezouata Biota. 64th Annual Meeting of the Palaeontological Association, Dec 2020, Oxford, United Kingdom. ⟨hal-03431869⟩
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