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Notes on the Graptolite Faunas of the Upper Ordovician and Lower Silurian

Published online by Cambridge University Press:  01 May 2009

K. A. Davies
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Extract

Work by the author on the rocks of the Upper Ordovician and Lower Silurian in Central Wales has led to a comparison with deposits of similar horizons in other areas. Several points of interest have arisen out of the investigation and may be of value in delimiting the zones of the Upper Ordovician and also in indicating the best workable definition of the base for the Silurian.

Type
Original Articles
Information
Geological Magazine , Volume 66 , Issue 1 , January 1929 , pp. 1 - 27
Copyright
Copyright © Cambridge University Press 1929

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References

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page 3 note 1 Ibid., p. 263.

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