The Quarterly journal of the Geological Society of London . 92 DR. A. HOLMES OX THE [vol. lxxiv, is probably immediately demonstrable, for Falconer ascribes theelliptical outline of the hills to the modification of original phaco-lithic intrusions (ojp. cit. p. 246). The generalization made byPassarge implies that in Adamawa and in South-West Africa thereare similar differences between the rocks of the two land forms-To the Rovuma type, however, this generalization only applies inspecial circumstances. Throughout German and Portuguese EastAfrica it is rather the exception to fin
The Quarterly journal of the Geological Society of London . 92 DR. A. HOLMES OX THE [vol. lxxiv, is probably immediately demonstrable, for Falconer ascribes theelliptical outline of the hills to the modification of original phaco-lithic intrusions (ojp. cit. p. 246). The generalization made byPassarge implies that in Adamawa and in South-West Africa thereare similar differences between the rocks of the two land forms-To the Rovuma type, however, this generalization only applies inspecial circumstances. Throughout German and Portuguese EastAfrica it is rather the exception to find the inselberg rocks differingmarkedly from their neighbours of the surrounding plains. The passage of banded gneisses into granite in certain peaks(as in the Etipoli Hills) and in the gneissic anticlines or elongateddomes of others (as, for example, the Mwima and Chica Ranges;.see PI. XI) are clearly cases where the discriminating hand ofdenudation has picked out slight differences of structure andmineral composition, and has revealed them in the exagge
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