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International correlation

By
R. A. Fortey
R. A. Fortey
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J. K. Ingham
J. K. Ingham
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A. W. Owen
A. W. Owen
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A. W. A. Rushton
A. W. A. Rushton
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Published:
January 01, 2000

Abstract

For the convenience of workers wishing to use the British charts in a global context, we include a scheme for the international correlation of the standard graptolite biozonation (Fig. 34). The base of the Middle Ordovician at the base of the Tripodus levis/Isograptuslunatus Biozone cannot be correlated into the Gondwana palaeocontinent and associated terranes with confidence and its mid-Arenig placement is speculative. The base of the Upper Ordovician is at the base of the gracilis Biozone. The base of gracilis Biozone is taken at the first appearance of N. gracilis itself, and the end of the zone at its last appearance. Work in progress by Richard Bettley indicates that first appearances of graptolite species such as Orthograptus apiculatus may eventually provide greater stratigraphic utility, but conservative usage is followed here.

Recent revisions are used for correlation into other regions important for the development of the Ordovician; however, where older names are still familiar and in use we have indicated them by square brackets below. Chronostratigraphic revisions to the North American terminology are after Ross et al. (1997). Bohemian chronostratigraphic standards were updated by Havli?ek et al. (1994); the lithological units that have been much employed previously are also indicated. For the East Baltic area the biostratigraphic scheme used by Männil & Meidla (1994) has been somewhat updated from Dronov & Holmer (1999). We have taken the Chinese standard from Chen et al. (1995) to whom reference should be made for correlation within China; standard lithological units of the Yangtze platform are also shown. We have not attempted to include the many terranes of the former Soviet Union.

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Geological Society, London, Special Publications

A revised correlation of Ordovician Rocks in the British Isles

R. A. Fortey
R. A. Fortey
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D. A. T. Harpe
D. A. T. Harpe
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J. K. Ingham
J. K. Ingham
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A. W Owen
A. W Owen
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M. A. Parkes
M. A. Parkes
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A. W. A. Rushton
A. W. A. Rushton
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N. H. Woodcock
N. H. Woodcock
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Geological Society of London
Volume
24
ISBN electronic:
9781862396920
Publication date:
January 01, 2000

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