Note 63 — Chapter VIII · PRE-CAMBRIAN VOLCANOES

The literature of Anglesey geology is now somewhat voluminous, but I may refer to the following as the chief authorities. The island is mapped in Sheet 78 of the Geological Survey of England and Wales, and its structure is illustrated in Horizontal Sections, Sheet 40. A full account of its various formations and of their relations to each other is given in vol. iii. of the Memoirs of the Geological Survey, "The Geology of North Wales," by Sir A. C. Ramsay, 2nd edit. 1881. The subject has been discussed by Professor Hughes, Quart. Journ. Geol. Soc. vols. xxxiv. (1878) p. 137, xxxv. (1879) p. 682, xxxvi. (1880) p. 237, xxxviii. (1882) p. 16; Brit. Assoc. Rep. (1881) pp. 643, 644; Proc. Camb. Phil. Soc. vol. iii. pp. 67, 89, 341; by Professor Bonney, Quart. Journ. Geol. Soc. vol. xxxv. (1879) pp. 300, 321; Geol. Mag. (1880) p. 125; by Dr. H. Hicks, Quart. Journ. Geol. Soc. vols. xxxiv. (1878) p. 147, xxxv. (1879) p. 295; Geol. Mag. (1879) pp. 433, 528 (1893) p. 548; by Dr. C. Callaway, Quart. Journ. Geol. Soc. vols. xxxvii. (1881) p. 210, xl. (1884) p. 567; and by the Rev. J. F. Blake, Quart. Journ. Geol. Soc. vol. xliv. (1888) p. 463. Further references to the work of these observers in Anglesey are given in Chapter xiii. p. 220 et seq. The Pre-Cambrian areas of Anglesey are shown in Map II.