Primeira evidência de locomoção na biota de Ediacara da Formação Mistaken Point de 565 Milhões de anos

sexta-feira, fevereiro 26, 2010

First evidence for locomotion in the Ediacara biota from the 565 Ma Mistaken Point Formation, Newfoundland

Alexander G. Liu1, Duncan Mcllroy2 and Martin D. Brasier1,2

-Author Affiliations

1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK

2Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X5, Canada


Evidence for locomotion in the Precambrian fossil record is scant. Reliable Ediacaran trace fossils are all younger than 560 Ma, and consist of relatively simple horizontal burrows and trails from shallow-water deposits. Here we describe an assemblage of macroscopic locomotory traces from deep-water environments at Mistaken Point, southeastern Newfoundland, Canada, dated to ca. 565 Ma. These trails extend the record of complex trace fossils back into the earliest Avalonian biota. Our new evidence for large motile organisms on the seafloor at this time suggests that at least some of these early Ediacaran organisms, whose biological affinities are widely debated, could have been muscular and of metazoan grade.

Received 7 May 2009.
Revision received 17 August 2009.
Accepted 18 August 2009.
© 2010 Geological Society of America


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