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Geological Magazine; November 2007; v. 144; no. 6; p. 1015-1019; DOI: 10.1017/S0016756807003895
© 2007 Cambridge University Press (CUP)
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Carbon isotope stratigraphy of the upper Telychian and lower Sheinwoodian (Llandovery–Wenlock, Silurian) of the Banwy River section, Wales

D. K. LOYDELL*,* and J. FRYDA{dagger}

* School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Road, Portsmouth PO1 3QL, UK
{dagger} Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic

* Author for correspondence: david.loydell{at}port.ac.uk

{delta}13Corg and TOC data are presented from the upper spiralis Biozone (Telychian, Llandovery, Silurian) through to the upper Sheinwoodian (Wenlock, Silurian) of the Banwy River section, Wales. In laminated hemipelagites from the Telychian, {delta}13Corg values rise through the upper lapworthi Biozone to a maximum in the lower insectus Biozone after which they decline slightly. The most conspicuous feature of the {delta}13Corg curve is the prolonged positive excursion in the Sheinwoodian, commencing in the upper murchisoni Biozone and ending in strata yielding Monograptus flexilis. This Sheinwoodian positive {delta}13C excursion in the Banwy River section correlates precisely with that recognized in the East Baltic. The interval with the highest {delta}13Corg values also records the highest TOC values, suggesting that for the Sheinwoodian at least, burial of carbon may have contributed to the positive {delta}13C excursion. Bioturbated strata yield very low TOC values; whether the {delta}13Corg values from these beds reflect a primary signal or the result of biostratinomic or diagenetic modification is uncertain.

Key Words: carbon isotope • Silurian • Telychian • Sheinwoodian • Llandovery • Wenlock






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