Hostname: page-component-7b7567c8c-2n9c9 Total loading time: 0 Render date: 2026-11-15T21:31:38.237Z Has data issue: false hasContentIssue false
  • English
  • Français

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.
Get accessRights & Permissions [Opens in a new window]

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.

Information

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

Cahen, L. & Snelling, N. J. 1966. The Geochronology of Equatorial Africa. North Holland Publishing Co., Amsterdam.Google Scholar
Code of Stratigraphic Nomenclature. 1961. American Commission on Stratigrapbic Nomenclature. Bull. Am. Ass. Petrol. Geol., 45, 645–665.Google Scholar
Harpum, J. R. 1960. The concept of the geological cycle and its application to problems of Pre-Cambrian geology. 21st Int. Geol. Congr., Copenhagen, 1960. Pt. 9, 201–6.Google Scholar
Holmes, A. 1951. The sequence of Pre-Cambrian orogenic belts in south and central Africa. 18th Int. Geol. Congr., London, 1948. Pt. 14, 254–269.Google Scholar
Nicolaysen, L. O. 1962. Stratigraphic interpretation of age measurements in Southern Africa, pp. 568–598 in Petrographic Studies: A volume in honour of A. F. Buddington. Geological Society of America, New York.Google Scholar
Quennell, A. M. & Haldemann, E. G. 1960. On the subdivision of the Pre-Cambrian. 21st Int. Geol. Congr., Copenhagen, 1960. Pt. 9, 170–7.Google Scholar
Rodgers, J. & McConnell, R. B. 1959. The need for rock-stratigraphic units larger than Group. Bull. Am. Ass. Petrol. Geol., 43, 1971–5.Google Scholar
Sloss, L. L. 1963. Sequences in the cratonic interior of North America. Bull. geol. Soc. Am., 74, 93–114.Google Scholar
Sloss, L. L. Krumbein, W. C. & Dapples, E. C. 1949. Integrated fades analysis, in Longwell, Chester, R., Chairman. Sedimentary facies in geological history. Mem. geol. Soc. Am., 39, 91–124.Google Scholar
Stratigraphic Classification and Terminology. 1961. 21 st Int. Geol. Congr., Copenhagen, 1960. Pt. 25.Google Scholar
The Stratigraphic Code. 1967. Rept. of the Stratigraphical Code Sub-Committee. Proc. geol. Soc. Lond., No. 1638, 75–87. (Ed. George, T. N. et al.).Google Scholar
Wheeler, H. E. 1958. Time-Stratigraphy. Bull. Am. Ass. Petrol. Geol., 32, 1047–1063.Google Scholar
Wheeler, H. E. 1959. Unconformity-bounded units in stratigraphy. Bull. Am. Ass. Petrol. Geol., 43, 1975–7.Google Scholar