Carter, J. D., Barber, W., and Tait, E. A., Geol. Survey Nigeria, Bull. No. 30, (1963).

Gunn and Watkins (1970) proposed that these lavas are part of the same volcanic episode, and that their feldspar phenocrysts might even have originated in the same magma chamber. In a future visit, we ...

The Mount Morgan No 7 Dam fossicking area lies within the Mount Morgan trondhjemite—a Middle Devonian aged intrusive granitoid type rock consisting of altered grey medium-grained locally porphyritic ...

"dacite porphyry intrusive” a silica-rich igneous rock with larger phenocrysts (crystals) within a fine-grained matrix "deposit” is a mineralised body which has been physically delineated by ...