Abstract
Dr Gordon Taylor stated that there were certain similarities between the structural history of the North Achill area and that found in the Dalradian rocks of the Slieve Gamph area, which was situated some 50 km approximately due east. Evidence has been deduced for the following structural sequence of events in the latter area: Phase I produced tight to isoclinal minor folds, a prominent schistosity (S<sub>1</sub>) and a lineation (L<sub>1</sub>). A major tectonic slide was formed (Lough Talt Slide) parallel to S<sub>1</sub>. Phase II produced tight minor folds with subvertical axial planes which trend ne–sw, a crenulation foliation (S<sub>2</sub>) parallel to the axial-planes of the minor folds and an elongation of pebbles and a rodding of quartz veins (L<sub>2</sub>) sub-parallel to the hinge lines of the minor folds. A major tectonic slide was formed (Glennawoo Slide) parallel to S<sub>2</sub>. Phase II produced a conjugate set of structures: (a) an earlier, more prominent series of open folds with a pronounced crenulation foliation (S<sub>3a</sub>) which trends nne–ssw and dips to the east. (b) a later series of open folds with an e–w trending axial plane trace (S<sub>3b</sub>) which dips to the north. Both sets of folds share a crenulation lineation (L<sub>3</sub>). Phase IV produced kink-bands, conjugate and open folds with nw–se trending axial-plane traces. The sequence closed with the formation of ne–sw trending faults followed by nw-se trending faults. However, structures similar to those of Dr Kennedy’s second phase had not been observed in the Slieve Gamph
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