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Graptolite Assemblages and the Doctrine of Trends

Published online by Cambridge University Press:  01 May 2009

G. L. Elles
G. L. Elles
Affiliation:
Newnham College, Cambridge.
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Extract

Viewed in the light of the Doctrine of Trends some interesting facts seem to emerge from the consideration of the graptolites characteristic of some of the zones or successive assemblages of these fossils. These seem to illustrate so clearly one of the fundamental tenets of the doctrine—namely, the necessity for a large degree of independence in the different characters—that they may be worth placing on record.

Type
Original Articles
Information
Geological Magazine , Volume 70 , Issue 8 , August 1933 , pp. 351 - 354
Copyright
Copyright © Cambridge University Press 1933

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References

1.Bulman, , 1927. Monographs of Pal. Soc., “The Dendroid Graptolites,” pt. i.Google Scholar
2.Stubblefield, , 1929. “Notes on some Early British Graptolites,” Geol. Mag., LXVI, 780, 268.Google Scholar
3.Bulman, , 1928. Loc. cit., pt. ii.Google Scholar
4.Elles, , 1925. “The Characteristic Assemblages of the Graptolite Zones of the British Isles,” Geol. Mag., LXII, 337.CrossRefGoogle Scholar