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Geological Society, London, Special Publications; 1993; v. 70; p. 195-209;
DOI: 10.1144/GSL.SP.1993.070.01.14
© 1993 Geological Society of London

Mesozoic

Strontium isotope stratigraphy for the Late Cretaceous: a new curve, based on the English Chalk

J. M. McArthur1, M. F. Thirlwall2, A. S. Gale3, W. J. Kennedy4, J. A. Burnett1, D. Mattey2 & A. R. Lord1

1 Department of Geological Sciences, University College, London, Gower Street, London WC1E 6BT, UK
2 Egham Hill, Egham, Surrey TW20 0EX, UK
3 Department of Geology, Royal School of Mines, Imperial College, Prince Consort Road, South Kensington, London SW7 2BP and Palaeontology Department, Natural History Museum, Exhibition Road, South Kensington, London SW7 5BD, UK
4 Department of Earth Sciences, Parks Road, Oxford OX1 3PR, UK

Marine 87Sr/86Sr decreases from 0.70775 in the Cenomanian to 0.70730 in the middle Turonian before increasing in a near-linear manner to >0.70775 in the early Maastrichtian. This variation has been defined using samples from the English Chalk that are closely integrated with the macrofossil and microfossil biostratigraphy of northwestern Europe. With this new isotope curve a stratigraphic resolution is attainable in correlation that is typically ±0.8 Ma for the Santonian and Campanian stages. Isotopic and biostratigraphic correlations between Dorset and Norfolk, in the UK, agree within the limit of analytical error in 87Sr/86Sr.





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