Bazley, R.A.B. 1975. The Tertiary igneous and Permo-Triassic rocks of the Ballyalton Borehole, County Down. Bulletin of the Geological Survey of Great Britain, 50, 71-101. Mannin, P.I. 1968. Summary of Geological Survey Boreholes 1968, 22p. Open File Report 8 Fowler, A., and Robbie, J.A., 1961. Geology of the Country around Dungannon, Sheet 35, Geological Survey of Northern Ireland Memoir, HMSO, Belfast. 274p. Wilson and Robbie 1966. Geology of the Country around Ballycastle, Sheet 8, Geological Survey of Northern Ireland Memoir, HMSO, Belfast. 370p. Smith, A. 1985. Geological results of the Lagan Valley groundwater development programme 1977-1984. Open File Report 71 Smith, A. 1986. Permo-Triassic and Dinantian rocks of the Belfast Harbour Borehole, BGS Report Vol.18, No 6, 1-13. Thompson, S.J. 1979, Preliminary Report on the Ballymacilroy No 1 Borehole, Ahoghill, Co Antrim. Open File Report 63. Johnston, T.P., 1979, Preliminary report on the Killary Glebe No. 1 borehole, Coalisland Co Tyrone. Open File Report 62. Thompson, S.J. 1997. Geology of the country around Antrim. 1:50 000 Geological Sheet 28 (Antrim). Geological Survey of Northern Ireland, Technical Report GSNI/97/6. 154 p. "Cameron, I.B. and Old, R.A. 1997. Geology of the country around Cookstown. 1:50 000 Geological Sheet 27 (Cookstown). Geological Survey of Northern Ireland. Technical Report GSNI/97/7" Bazley, R.A.B. 1997, Brandon, A. and Arthurs, J.W. 1997. Geology of the coutry around Limavady and Londonderry. Technical Report, GSNI/97/1, 96p. Bazley, R.A.B. and Thompson, S. J. 2001. The geology of the country around Larne. A description of the Larne (21) Sheet of Northern Ireland, Technical Report GSNI-01/1. 59 p. Legg, I.C., Johnston, T.P., Mitchell, W.I. and Smith, R.A. 1998. Geology of the Country around Derrygonnelly and Marble Arch, The Stationary Office, London. 82p. Wilson, H.E. and Manning, P.I. 1978. Geology of the Causeway Coast, Volume 2. HMSO, Belfast,172p.