Note 179 — Chapter XXXIV · THE SYSTEM OF DYKES IN THE TERTIARY VOLCANIC SERIES
Reading edition
Trans. Geol. Soc. iii. p. 80.
[180] Trans. Roy. Soc. Edin. xiv. p. 690 et seq.
[181] Trans. Geol. Soc. iii. p. 226. He believed that dykes in Secondary rocks reach a much greater thickness than in other formations. My own observations do not confirm this generalisation.