Note 118 — Chapter IX
Reading edition
Quart. Journ. Geol. Soc., vol. ii. p. 394 (1846); Ibid., vol. iv. p. 47 (1847); Ibid., vol. v. p. 355 (1849); Ibid., vol. v. pp. 23, 30.
[119] Williamson has noticed this in his excellent Memoirs in the Phil. Trans.