On an Intrusion of Granite into Diabase at Sorel Point Northern Jersey

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Abstract
P rominent among the many points of interest which the igneous rocks of the Channel Islands offer for study are those that arise from the intrusion of one rock into another. In Sark the relations of the aplite to the pre-existing hornblendite are well known through the work of Prof. Bonney & the Rev. Edwin Hill; in Guernsey the latter Author has touched briefly on the relations, apparently of rather unusual character, existing between a granite and a dioritic rock; in Jersey M. Noury, in his work upon that island, has remarked upon the complete penetration in more than one place of a ‘diorite’ by a granite. It is to one of these intrusions, that of the north coast, that the present communication relates. In many respects both the rocks and the locality are favourable for study. The contrast presented by the brick-red granite so poor in ferromagnesian constituents as to be practically au aplite, and the dark basic rock into which it intrudes, is sufficiently striking to render the broad facts apparent almost at a glance. The magnificent cliffs, under favourable circumstances of tide and weather, afford ample opportunities for the study of these relations in greater detail. Anyone, walking westward from St. John's, in the centre and north of the island, and taking the road to Les Meuriers, will find, by turning to the right when reaching the sea and keeping along the edge of the cliff, the relations of the two rocks displayed as finely as he can

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