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Stratigraphic classification in Pre-Cambrian rocks

Published online by Cambridge University Press:  01 May 2009

P. M. Allen  and
A. J. Reedman
P. M. Allen
Affiliation:
Overseas and Mineral Surveys, Institute of Geological Sciences, 5 Prince's Gate, London S. W. 7.
A. J. Reedman
Affiliation:
Overseas and Mineral Surveys, Institute of Geological Sciences, 5 Prince's Gate, London S. W. 7.
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Summary

The system of stratigraphic classification used by field geologists working in Africa is briefly reviewed and a hierarchy of terms is suggested, taking into account the requirements of those interested in local field problems and those concerned with the tectonics and composition of the African continent as a whole. On the local scale, rock units are best named according to the lithostratigraphic classification. On a regional scale, the criteria for defining rock units are essentially tectonostratigraphic and two new terms for them, in ascending order of magnitude, Orogenic Assemblage and Orogenic Complex, are proposed. The two schemes are united through the Sequence, which can contain any number of lithostratigraphic units of any order of magnitude.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 3 , June 1968 , pp. 290 - 297
Copyright
Copyright © Cambridge University Press 1968

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References

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