Structure and stratigraphy of the Dalradian rocks of the Bennabeola area, Connemara, Eire

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Abstract
Summary: The geology of an area of 400 sq km of Lower and Middle Dalradian rocks is described. It consists mainly of rocks belonging to the Appin and Argyll Groups which have been strongly deformed during four stages (F 1 –F 4 ) with the major development of tectonic slides occurring before F 3 . Eighteen major F 3 folds, whose geometry is described, are correlated across the Connemara antiform (F 4 ); they refold an earlier nappe-like (? F 2 ) antiform, the Derryclare fold. All of the Appin Group rocks and the Cleggan Boulder Bed Formation are contained within the core of the Derryclare fold, which locally has attenuated limbs. A zone of vertical foliation, the ‘steep belt’, is present in the south of the area. It is superimposed upon the originally steeply inclined, south-facing Derryclare fold and appears to have developed during F 4 .