1. Probable Old Red Sandstone conglomerates around Tongue and adjacent areas, north Sutherland
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4. Chonglakmani C. Sattayarak N. (1978) Proceedings GEOSEA III Stratigraphy of the Huai Hin Lat Formation (Upper Triassic) in northwestern Thailand, ed Nutalaya P. (Dept Mineral Resources, Bangkok, Thailand), pp 739–762.
5. Crampton C. B. Carruthers R. G. (1914) The Geology of Caithness, Memoir of the Geological Survey of Great Britain.