Note 139 — Chapter XXXIII
Reading edition
Trans. Geol. Soc. vol. iv. (1817), p. 21. See also Tilloch's Phil. Mag. vols. xlix. and l.
[140] Cambridge Phil. Trans. vol. ii. (1827), pp. 21, 139.
[141] Trans. Nat. Hist. Soc. Northumberland, i. (1831), p. 9.
[142] Op. cit. i. p. 44.
[143] Op. cit. i. pp. 305, 306, 308, 309.
[144] Op. cit. ii. (1838), p. 343.
[145] Trans. Northumberland and Durham, ii. (1868), p. 30.
[146] Proc. Roy. Soc. xxiii. (1875), p. 543.
[147] Quart. Journ. Geol. Soc. xl. (1884), p. 209.