Fig. 1 The granitic plutons of Donegal (modified after Pitcher et al., 1987), showing locations of myrmekite-bearing rocks some of which are illustrated in Figs. 5, 6, and 7. (a) Locality 4 on map of the Main Donegal Granite. (b) Locality 2 on map of the Geology of the Thorr District, Co. Donegal. (c) Locality 3 and (d) between localities 10 and 11 on map of the Main Donegal Granite. (e) Locality 2 and (f) locality 9 on map of the Ardara pluton. (g) Locality 7 and (h) locality 4 on map of the Rosses Granite Complex. (i) and (j) Locality 1 on map of the Geology of the Thorr District, Co. Donegal. Map locations taken from Pitcher et al. (1987).