Some Discordant Fold Structures from the Dalradian of Craignish, Argyll, and Rosguill, Co. Donegal

Minor folds with axial directions at a marked angle to the regional fold plunge have been observed on the Craignish peninsula, western Scotland, and on the Rosguill peninsula, northwest Donegal, western Ireland, and are described and discussed as discordant structures. The folds of the Craignish peninsula are thought to have resulted from rotation of a detached structure, originally concordant, into a new position. Some of those of the Rosguill peninsula are thought to have been produced by the same process; others are attributed to refolding which caused development of a new schistosity in the matrix. Most of the discordant structures are no longer attached to their original roots, and in such cases of detached structures, care should be used in analysis.