IV.—The Basic Intrusions East of Gelli Hill, Radnorshire

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Abstract
During the last few years I have spent a considerable amount of time studying the geology of the country east of Llandrindod, but much still remains to be done, and the present paper merely embodies a few of the points which seem to be satisfactorily established with regard to a small portion of the area. Three distinct types of igneous rocks are recognized, and some facts and ideas with regard to each are put forward.

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