Note 236 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGE
Reading edition
For an account of the Cross Fell inlier of Silurian rocks see the paper by Professor Nicholson and Mr. Marr, with the petrographical appendix by Mr. Harker. Quart. Journ. Geol. Soc. vol. xlvii. (1891), pp. 500, 512.