Note 104 — Chapter XXXII · PERMIAN VOLCANOES OF ENGLAND

Siluria, 4th edit. (1867), p. 333. See also Berger, Trans. Geol. Soc. vol. i. (1811), pp. 98-102; Conybeare and Phillips, Geology of England and Wales, p. 313, footnote; De la Beche, Report on the Geology of Cornwall, Devon and West Somerset (1839), chap. vii. p. 193. Messrs. Hull and Irving (Quart. Journ. Geol. Soc. vol. xlviii. 1892, pp. 60, 68) have more recently discussed the subject, and follow the view of Murchison.

[105] Murchison cogently argued that as no signs of volcanic activity were known in the Trias, but were abundant in the Permian system, the Devonshire rocks might be regarded as appertaining to the older series, op. cit. Triassic volcanic rocks, however, are now well known on the Continent.