The Arenig Rocks of Arran, and their Relationship to the Dalradian Series

Abstract

The existence of pillow lavas, black shales, and cherts in North Glen Sannox, Arran, has been known since W. Gunn carried out the detailed mapping of this part of the island for the Geological Survey in 1899. A description of these rocks, in which that author makes the suggestion, not since seriously disputed, that they are of probable Arenig age (Gunn, 1900) was first published in the Summary of Progress for 1899. Full accounts, to which the reader is referred for details not repeated in the present paper, were later given by Gunn (1903, 1905) and by Tyrrell (1928).