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Published online by Cambridge University Press: 01 May 2009
1 “Possible Explanation of the North Devon Section,” by Prof. E. Hull, Geol. Mag. December, 1878, p. 529.
2 Brit. Assoc. Rep. 1877, Trans, of Sections, p. 69
3 Journ. Geol. Soc. Dublin, vol. vi. p. 227
4 “Siluria,” 4th edit. p. 272. H. B. Woodward, “Geology of England and Wales;” p. 69.