A striking feature of the geology of the Lizard is the occurrence of rocks very rich in, or consisting entirely of epidote; as bands parallel to the foliation of the hornblende-gneiss and the green schists of the Old Lizard Head Series; as lenticles caused by local enlargement of those bands; and sometimes as veins cutting the foliation, for instance on Polurrian Beach. The coast-sections at Mullion do not show great development of these epidotic rocks in the hornblende-gneiss but bands one inch thick occur. At Porthallow and north of Porthoustock there is an even smaller development of these rocks, but along the coast from Pentreath Beach southwards round Lizard Point to Cadgwith epidote bands and lenticles are abundant. Sir John Flett remarks in the 1912 Memoir (p. 50) on the perfection of this banding, “which cannot be paralleled anywhere else in Britain,” but he has told me that in Anglesey epidotic rocks approach them in abundance. These Anglesey rocks were described by Dr. E. Greenly in the Survey Memoir of that area (1919, pp. 108 and 109 inter alia).