Note 82 — Chapter IX · CHARACTERISTICS OF THE CAMBRIAN SYSTEM IN BRITAIN
Reading edition
For early researches on the older Palæozoic volcanic rocks of Britain, see Sedgwick, Proc. Geol. Soc. vols. ii. (1838) pp. 678, 679, iii. (1841) p. 548, iv. (1843) p. 215; Quart. Journ. Geol. Soc. vols. i. (1845) pp. 8-17, iii. (1847) p. 134. Murchison, Proc. Geol. Soc. vol. ii. (1833-34) p. 85; Silurian System (1839) pp. 225, 258, 268, 287, 317, 324, 401; Siluria, 4th edit. (1867) p. 76 et seq. De la Beche, Mem. Geol. Survey, vol. i. (1846) pp. 29-36. A. C. Ramsay in the Maps and Horizontal Sections of Wales published by the Geological Survey; also Descriptive Catalogue of the Rock-Specimens in the Museum of Practical Geology, 1st edit. (1858), 2nd edit. (1859), 3rd edit. (1862); "The Geology of North Wales," forming vol. iii. of Memoirs of the Geological Survey, 1st edit. (1866), 2nd edit. (1881).