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Geological Society, London, Special Publications; 2000; v. 180; p. 1-21;
DOI: 10.1144/GSL.SP.2000.180.01.02
© 2000 Geological Society of London

Review

A review of Devonian time scales: databases, construction and new data

E. A. Williams1, P. F. Friend2 & B. P. J. Williams3

1 , CRPG-CNRS, B.P. 20, 54501 Vandoeuvre-lès-Nancy cedex, France
2 Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
3 Department of Geology and Petroleum Geology, University of Aberdeen, Meston Building, King’s College, Aberdeen AB24 3UE, UK

Aspects of the isotopic age and stratigraphical databases underpinning Devonian geological time scales are reviewed to assess differences in recent U-Pb zircon-based schemes and older schemes based on Rb-Sr, K-Ar, 40Ar-39Ar dating of minerals and whole-rock samples. The various methods of time-scale construction are described and, with their databases, 14 calibrations of Devonian time are discussed. Finally, the most recent data are collated and compared against current U-Pb-based time scales.