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XV.—Quantitative Evolution. II. Compositæ Dp-ages in Relation to Time

Published online by Cambridge University Press:  15 September 2014

James Small
James Small
Affiliation:
Department of Botany, Queen's University, Belfast
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Extract

The ages of the various tribes and sub-tribes of Compositæ have been calculated in doubling periods, according to Yule's formulæ; these are known briefly as Dp-ages (Small and Johnston, 1937; Udny Yule, 1924). Yule advises caution in interpreting Dp-ages in terms of geological time, but if his conceptions are to be applied to realities there should be some method of comparing Dp-ages with actual ages. Further, in the case of Compositæ, an almost complete parallel seriation has been found for Dp-ages and order of origin of both tribes and sub-tribes (Small and Johnston, 1937). Since the order of origin has been provisionally correlated with geological time (Small, 1919) it is possible to compare the calculated Dp-ages with suggested points of origin in geological time. This has been done by Small and Johnston (1937, Tables, VI, VII).

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 57 , 1938 , pp. 215 - 220
Copyright
Copyright © Royal Society of Edinburgh 1938

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References

References to Literature

Barrell, J., 1917. “Rhythms and the Measurement of Geologic Time,” Bull. Geol. Soc. Amer., vol. xxviii, pp. 745–904.CrossRefGoogle Scholar
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