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A new assemblage of juvenile Ediacaran fronds from the Drook Formation, Newfoundland

Alexander G. Liu, Duncan McIlroy, Jack J. Matthews and Martin D. Brasier
Journal of the Geological Society, 169, 395-403, 11 July 2012, https://doi.org/10.1144/0016-76492011-094
Alexander G. Liu
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ
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Duncan McIlroy
Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, Canada
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Jack J. Matthews
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ
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Martin D. Brasier
Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, CanadaDepartment of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
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Abstract

A new assemblage of frondose and filamentous Ediacaran macrofossils is reported from the upper Drook Formation of Pigeon Cove, Newfoundland. The frondose forms, all less than 3 cm in length, are considered to represent the juvenile growth stages of Ediacaran organisms including Charnia spp. and Trepassia spp. This is the first report of an assemblage wholly dominated by such small juvenile rangeomorph forms, and provides insights into the ontogeny and ecology of these earliest members of the Ediacara biota. The fronds occur alongside filamentous forms with similarities to microbial taxa, and both morphotypes are considered to postdate an assemblage of large ivesheadiomorphs on the same bedding plane. If so, the assemblage represents one of the oldest documented examples of secondary community succession. The new Pigeon Cove fossils also extend the stratigraphic ranges of several key frondose taxa (Charnia masoni, Charniodiscus spp.) back into some of the oldest known macrofossil-bearing strata. These revised ranges lend support to the suggestion that the previously observed low diversity within the Drook Formation may represent a combination of taphonomic and sampling artefacts. Furthermore, this assemblage implies that the diversification of architectural morphotypes within the Ediacara biota took place earlier than hitherto suspected.

Supplementary material: A document containing figures of additional juvenile rangeomorphs and filamentous specimens, a table of specimen dimensions, and a complete digitized map of the Pigeon Cove bedding plane, is available at www.geolsoc.org.uk/SUP18529.

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Journal of the Geological Society: 169 (4)
Journal of the Geological Society
Volume 169, Issue 4
July 2012
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A new assemblage of juvenile Ediacaran fronds from the Drook Formation, Newfoundland

Alexander G. Liu, Duncan McIlroy, Jack J. Matthews and Martin D. Brasier
Journal of the Geological Society, 169, 395-403, 11 July 2012, https://doi.org/10.1144/0016-76492011-094
Alexander G. Liu
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ
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  • For correspondence: agscl2@cam.ac.uk
Duncan McIlroy
Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, Canada
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Jack J. Matthews
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ
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Martin D. Brasier
Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NL, A1B 3X5, CanadaDepartment of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
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A new assemblage of juvenile Ediacaran fronds from the Drook Formation, Newfoundland

Alexander G. Liu, Duncan McIlroy, Jack J. Matthews and Martin D. Brasier
Journal of the Geological Society, 169, 395-403, 11 July 2012, https://doi.org/10.1144/0016-76492011-094
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