Note 20 — Chapter XXIX · THE CARBONIFEROUS VOLCANOES OF ENGLAND
Reading edition
Trans. Roy. Soc. Edin. i. p. 275, et seq. Hutton specially mentions the toadstone of Derbyshire as one of the rocks produced by fusion, p. 277.
[21] General View of the Agriculture and Minerals of Derbyshire (1811).
[22] Outlines of the Geology of England and Wales (1822), p. 448.
[23] See Sheets 71 N.W., 72 N.E., 81 N.E. and S.E. and 82 S.W. of the Geological Survey of England and Wales.