Preface top ↑
The map was cartographically drawn by A. W. GATRELL of Cartographic Services, Cirencester, and printed by JOHN BARTHOLOMEW, Edinburgh. The finance for producing the map was generously provided by the Overseas Development Ministry as an additional grant to research scheme R2679.
The text was compiled by P. BOWDEN and J. A. KTNNAIRD based upon notes, sample collections, and constructive criticisms from E. C. IRE, S. I. ABAA, U. M. TURAKI, C. A. ASERNETHY, J. N. BENNETT, and D. C. TURNER. Other individuals, and Mining Companies, who have substantially contributed to the map are listed in the left hand column beneath the geological information for each ring complex. The various sources of information used to compile the map are given briefly as footnotes, and more substantially within the reference list at the end of this article.
The Nigerian Mining Corporation, the Nigerian Mining Companies and the
Nigerian Geological Survey gave access to field areas and provided
many unpublished reports. Without the continued help of the Nigerian
Government the completion of the work reported here would not have
Extents of the map are approx:
Longitude: 8,25 ° W - 10.25 ° W Latitude: 8,5 ° S - 11,9 ° S