Note 134 — Chapter XII · CHARACTERS OF THE SILURIAN SYSTEM IN BRITAIN. THE ARENIG VOLCANOES
Reading edition
Mem. Geol. Survey, vol. iii. 2nd ed., p. 96.
[135] The ashes and agglomerates of Rhobell Fawr can be seen in various places to rest on the highest members of the Lingula Flags. See Messrs. Cole and Holland, Geol. Mag. (1890), p. 451.
[136] Op. cit. p. 72.
[137] He was disposed to regard Rhobell Fawr as one of the great centres of eruption of the district. See Memoir of A. C. Ramsay, p. 81, and Geology of North Wales, 2nd edit. p. 98.
[138] Op. cit. pp. 71, 96, 105.
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