Note 65 — Chapter XXIX · THE CARBONIFEROUS VOLCANOES OF ENGLAND
Reading edition
"The Eruptive Rocks of Brent Tor and its Neighbourhood," Mem. Geol. Surv. 1878. "On the Schistose Volcanic Rocks occurring on the west of Dartmoor, with some Notes on the Structure of the Brent Tor Volcano," Quart. Journ. Geol. Soc. xxxvi. (1880), p. 286.
[66] "The Eruptive Rocks of Brent Tor," p. 45.