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Published online by Cambridge University Press: 01 May 2009
page 476 note 1 Ward, J. C.Quart. Journ. Geol. Soc. vol. xxv. p. 295;Google ScholarGeol. Mas. Vol. IX. p. 389.Google ScholarLucas, J.Geol. Mag. Vol. IX. p. 338.Google Scholar For another case of rock staining see Mems. of Geol. Survey of Great Britain, vol. i. p. 45Google Scholar