An occurrence of copper-ore nodules, probably ferruginous chalcocite, in sandstones and shales of the Daibaig beds (Precambrian) at Clachtoll, on the northwest coast of Scotland, is described. The ore is calculated to carry less than 0.5 percent copper. The origin is discussed and compared with the copper-bearing shales of Mansfeld, Germany.

You do not currently have access to this article.