Note 264 — Chapter XIII · THE ERUPTIONS OF LLANDEILO AND BALA AGE (continued 2)
Reading edition
Trans. Geol. Soc. 2nd ser. vol. i. (1819), pp. 324-334.
[265] Silurian System (1839), p. 457.
[266] Mem. Geol. Surv. vol. ii. part i. (1848), p. 194.
[267] "Geology of East Somerset," etc., in Mem. Geol. Surv. (1876), p. 210; descriptions by Mr. F. Rutley.
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