Note 128 — Chapter XI · THE CAMBRIAN VOLCANOES OF NORTH WALES, THE MALVERN HILLS AND WARWICKSHIRE
Reading edition
Op. cit. p. 323.
[129] Op. cit. p. 557.
[130] Geol. Mag. (1886), p. 540. In this paper full references will be found to the previous papers on the geology of the district. Jukes had recognized that the rocks below the coal-bearing strata were "older than the Upper Silurian, perhaps older than any Silurian," Mem. Geol. Survey, "South Staffordshire Coal-field" (1859), p. 134.