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High resolution carbon isotope stratigraphy of the basal Silurian stratotype (Dob's Linn, Scotland) and its global correlation

Underwood, Charlie J. and Crowley, S.F. and Marshall, J.D. and Brenchley, P.J. (1997) High resolution carbon isotope stratigraphy of the basal Silurian stratotype (Dob's Linn, Scotland) and its global correlation. Journal of the Geological Society 154 (4), pp. 709-718. ISSN 0016-7649.

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Official URL: http://dx.doi.org/10.1144/gsjgs.154.4.0709

Abstract

Since its designation as the Global Stratotype Section and Point (GSSP) for the base of the Silurian System, the choice of Dob's Linn, Southern Scotland, has received criticism due to the difficulties of relating its well constrained graptolite biostratigraphy to shallow water sequences elsewhere. Kerogen samples from across the Ordovician-Silurian boundary interval at Dob's Linn have yielded carbon stable isotope signatures consistent with those recorded elsewhere, in particular showing a clear positive δ13C excursion in the terminal Ordovician. The architecture of the δ13C curve from Dob's Linn enables very high resolution stratigraphic subdivision and direct correlation between the deep water Dob's Linn section and time equivalent carbonate shelf deposits. An integrated stratigraphic scheme using isotope stratigraphy and biostratigraphy of graptolites, conodonts and shelly faunas has been constructed. This direct correlation shows that the shallow water successions, including the former stratotype candidate at Anticosti Island, are generally incomplete, with hiatuses related to the rapid sea level changes during the Hirnantian stage. This confirms and greatly increases the global utility of Dob's Linn as a boundary stratotype.

Item Type: Article
Additional Information: This material has been published in The Journal of the Geological Society, volume 154, issue 4 (1997), pages 709-718, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by The Geological Society of London. C. Underwood was at the University of Liverpool when this paper was published. He is currently a Lecturer at Birkbeck.
Keyword(s) / Subject(s): Carbon Isotopes, Graptolites, Ordovician, Silurian, Stratigraphy. Carbon Isotopes, Graptolites, Ordovician, Silurian, Stratigraphy. Carbon Isotopes, Graptolites, Ordovician, Silurian, Stratigraphy. Silurian, Ordovician, Graptolites, stable isotopes, carbon, oxygen, GSSP, Scotland
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Earth and Planetary Sciences
Depositing User: Charlie Underwood
Date Deposited: 21 Mar 2005
Last Modified: 17 Apr 2013 12:32
URI: http://eprints.bbk.ac.uk/id/eprint/109

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