Note 151 — Chapter XXXIII
Reading edition
"On the Chronology of the Trap-rocks of Scotland," Trans. Roy. Soc. Edin. xxii. (1861), p. 649.
[152] Proc. Roy. Soc. Edin. vi. (1867), p. 71.
[153] Brit. Assoc. Report (Dundee), 1867, Sections, p. 49.
[154] Quart. Journ. Geol. Soc. xxvii. (1871), p. 279.