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E. A. Williams, Peter F. Friend, and Brian P. J. Williams
A review of Devonian time scales; databases, construction and new data (in New perspectives on the Old Red Sandstone)
Geological Society Special Publications (2000), 180 1-21
Abstract: Index Terms/Descriptors: GeoRef, Copyright 2004, American Geological Institute.
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, 40 Ar- 39 Ar 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.
absolute age; Ar-40/Ar-39; argon; biostratigraphy; biozones; chronostratigraphy; data; data bases; data processing; Devonian; ion probe data; isotope ratios; isotopes; K/Ar; mass spectra; nesosilicates; noble gases; orthosilicates; Paleozoic; radioactive isotopes; Rb/Sr; SHRIMP data; silicates; spectra; stable isotopes; succession; time scales; U/Pb; whole rock; zircon; zircon group