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Ordovician faunas of Burgess Shale type


The renowned soft-bodied faunas of the Cambrian period, which include the Burgess Shale, disappear from the fossil record in the late Middle Cambrian, after which the Palaeozoic fauna1 dominates. The disappearance of faunas of Burgess Shale type curtails the stratigraphic record of a number of iconic Cambrian taxa. One possible explanation for this loss is a major extinction2,3, but more probably it reflects the absence of preservation of similar soft-bodied faunas in later periods4. Here we report the discovery of numerous diverse soft-bodied assemblages in the Lower and Upper Fezouata Formations (Lower Ordovician) of Morocco, which include a range of remarkable stem-group morphologies normally considered characteristic of the Cambrian. It is clear that biotas of Burgess Shale type persisted after the Cambrian and are preserved where suitable facies occur. The Fezouata biota provides a link between the Burgess Shale communities and the early stages of the Great Ordovician Biodiversification Event.

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Figure 1: Exceptionally preserved Burgess Shale-type organisms from the Early Ordovician Fezouata biota.
Figure 2: Exceptionally preserved post-Cambrian elements of the Fezouata biota.

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S. Butts (Yale Peabody Museum of Natural History), A. Prieur (Lyon 1 University), D. Berthet (Natural History Museum of Lyon), A. Médard-Blondel and S. Pichard (Natural History Museum of Marseille), G. Fleury (Natural History Museum of Toulouse), the National Museums of Scotland and the Sedgwick Museum provided access to specimens. M. Ben Said Ben Moula, W. and D. De Winter, B. MacGabhann, R. and V. Reboul-Baron, C. Upton, B. Van Bocxlaer, and D. and K. Van Damme assisted with fieldwork, and B. Tahiri arranged logistical support. E. Champion helped with the preparation of figures. J. De Grave and B. Van Bocxlaer (Ghent University) provided photographic equipment, and the Palaeontology and Petrology Research Units of Ghent University allowed use of their imaging facilities. P. and O. Van Roy-Lassaut financially aided fieldwork. This research was funded by an Agency for Innovation by Science and Technology (IWT) doctoral fellowship and by an Irish Research Council for Science, Engineering and Technology (IRCSET) – EMPOWER postdoctoral fellowship awarded to P.V.R. Fieldwork was supported by a National Geographic Society Research and Exploration grant.

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All authors carried out field work and contributed to the interpretation of the fossils. P.V.R., P.J.O., J.P.B. and D.E.G.B. wrote the paper with input from the other authors.

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Correspondence to Peter Van Roy or Derek E. G. Briggs.

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Van Roy, P., Orr, P., Botting, J. et al. Ordovician faunas of Burgess Shale type. Nature 465, 215–218 (2010).

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