Note 247 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGE
Reading edition
This unconformability has been described and discussed by various observers. The general impression has been, I think, that the break is only of local importance. Mr. Aveline, however, believed it to be much more serious, and he regarded the volcanic rocks which were ejected during the deposition of the Coniston Limestone series as much later in date than those of the Borrowdale group. See Mem. Geol. Survey, Explanation to Sheet 98 N.E. 2nd edit. p. 8 (1888).