The northeast Ox Mountains inlier forms an ENE-trending, 40km long, narrow, arcuate ridge of bare, psammitic hills which passes to the southeast of the town of Sligo in northwest Ireland. (It lies to the northeast of the area of Fig. 16 shown on Fig. 13 and ornamented tentatively as Grampian Group in Chapter 4). It is surrounded by Lower Carboniferous sediments except at its western end where a poorly exposed fault, the Ladies Brae fault, brings it against pelitic rocks of inferred Dalradian age in the central Ox Mountains inlier (Lemon 1971; Phillips et al. 1975; Chapter 4, this volume).
Lithologically the inlier comprises migmatitic psammites, minor pelites and rare marbles, with locally important early ultrabasite, metabasite and metagranitoid bodies, and late granite pegmatites. A stratigraphical succession has not been established; Lemon’s (1971) map shows undifferentiated ‘Moine feldspathic granulites’, although Pyne (1972) mapped three formations, a pelite sandwiched between two psammitic units, to the west of Collooney.
Figures & Tables
This second and completely revised edition of Special Report No. 6 provides a comprehensive review and report of work earned out since 1975. It emphasizes the relationship between, and the correlation of, the units in to which the Precambrian rocks of England, Ireland, Scotland, Wales and the Channel Islands have been divided The chapters also provide a comprehensive bibliography of the work on which the correlations have been based.