The Torridon Sandstone in relation to the Ordovician Rocks of the Northern Highlands

Abstract

The late Sir R. I. Murchison and his co-worker. Prof. A. Geikie, came to the conclusion that the Sutherland quartzites rested unconformably upon the Torridon Sandstone, and from this break in the succession they inferred that the latter was the equivalent of the Longmynd or Harlech series, the Upper Cambrian being wanting. In some localities the sections, seen from a distance, seem to confirm their opinion; but a careful and detailed examination made last summer convinced me that, in some localities at least, this appearance is deceptive, and that the sandstone passes up with perfect conformity into the quartzite. I was accompanied during my work by Mr. G. H. Bailey, B.Sc., of Tettenhall College, to whom I am indebted for much intelligent and active assistance.