Abstract

At the tip of the headland between Foxes Hole and Dutch Gin bay, on the coast of Pembrokeshire, Wales, an exposure of Precambrian schists, regionally metamorphosed, has been found. They are here named the Dutch Gin schists. They consist of 71 percent quartz, 3 percent almandine garnet, 6 percent muscovite, 9 percent chlorite, 5 percent calcite, and 6 percent pyrite, and belong to the quartz-albite-epidote-almandine subfacies of the green schist facies. They are intruded by the Johnston diorite and the nature of the contact and the adjacent foliation are described. It is suggested that all foliation in the igneous rocks resulted from the intrusive movements, rather than from two different periods of movement.

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