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The Classification of Igneous Rocks: An Historical Approach

Published online by Cambridge University Press:  01 May 2009

S. I. Tomkeieff
S. I. Tomkeieff
Affiliation:
King's College, University of Durham, Newcastle-on-Tyne.
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Extract

There can be little doubt that most petrologists will welcome J- the classification of igneous rocks according to their grainsize as proposed by the British Association Committee on Rock Nomenclature and Classification (1). This classification has been incorporated in the new edition of the well-known textbook of Hatch and Wells (2) and has recently been very ably defended by Wells (3). To avoid misunderstanding it must be emphasized that grain-size is taken to be only one of the factors in the classification of igneous rocks and not the sole factor, and that the suggested limits between different grades of granularity must be taken at the present time to be only provisional.

Type
Original Articles
Information
Geological Magazine , Volume 76 , Issue 1 , January 1939 , pp. 41 - 48
Copyright
Copyright © Cambridge University Press 1939

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References

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