1. (1) Whitley N. , “On the Remains of Ancient Volcanoes on the North Coast of Cornwall in the Parish of St. Minver”: Thirtieth Ann. Rep. Roy. Inst. Com., p. 60, 1849.
2. (21) Flett J. S. , in ”The Geology of the Country around Plymouth and Liskeard”: Mem. Geol. Surv., 1907, p. 98.
3. (44) Fox H. , Jour. E. Inst. Cornwall, vol. xii, p. 34, 1895.
4. (40) Fox H. , & Teall J. J. H. , “On a Soda-felspar Rock at Dinas Head, North Coast of Cornwall”: GEOL. MAG., 1895, p. 13.