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Journal of the Geological Society; 1998; v. 155; issue.1; p. 5-12;
DOI: 10.1144/gsjgs.155.1.0005
© 1998 Geological Society of London

Article

Neonereites uniserialis from c. 600 Ma year old rocks in western Scotland and the emergence of animals

M. D. BRASIER1 & D. McILROY2

1 Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK(e-mail: Martin.Brasier{at}earth.ox.ac.uk)
2 School of Earth Sciences, Macquarie University, Sydney, 2109, Australia

A chain of pellets (Neonereites uniserialis), usually attributed to a coelomate or pseudocoelomate metazoan, is described from the middle Dalradian Bonahaven Formation of western Scotland, in sandstones not far above the Port Askaig Tillite. This trail lies more than 8 km below U-Pb zircon-dated Tayvallich lavas (595 ± 4 Ma) and predates early deformation plus intrusion by granites at Ben Vuirich dated at 597 ±11 and 590 ± 2 Ma. U-Pb zircon chronology for early metazoan evolution suggests that this is the earliest putative evidence for coelomates or pseudocoelomate discovered so far, with a minimum ‘interglacial’ age of c. 600 Ma bp. It is from about this time that a fall takes place in the maximum {delta}13C of carbonates, suggestive of a decline in the long term rate of carbon burial. One explanation for this decline is the increasing impact of metazoan bioturbation through the late Neoproterozoic to Cambrian interval.

Key Words: Proterozoic • Dalradian • Cambrian • ichnofossils • U-Pb




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