1. Allen P. M. in Igneous rocks of the British Isles, Lower Palaeozoic volcanic rocks of Wales, ed Sutherland D. (Wiley, London).
2. Allen P. M. Jackson A. A. (1978) Bull. geol. Surv. Gt Br. The Bryn-teg Borehole, North Wales, 61. 51.
3. Bailey E. B. (1960) Mem. geol. Surv. U.K. The geology of the Ben Nevis and Glen Coe, 2nd Ed. 307.
4. Baker J. W. (1971a) Proc. geol. Ass. The Proterozoic history of Southern England, 82, pp 249–266.
5. Intra-Lower Palaeozoic faults in the Southern Irish Sea area;Baker;Geol. Mag.,1971