RECORD: Darwin, C. R. I may also remark that generally where the cleavage of the Mica Slates is not well developed. CUL-DAR42.77 Transcribed by John van Wyhe (Darwin Online,

REVISION HISTORY: Transcribed by John van Wyhe, corrections by Kees Rookmaaker 5.2011. RN1

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Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin.


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I may also remark, that generally where the cleavage of the Mica Slates is not well developed, the angle is small. —

Tres Montes [twisted] where dykes

77 verso

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(b) Perhaps in several cases the presence of <remainder excised>

to be parallel) in these Slates has determine the lines of dyke. — But we <remainder excised>

of up burst must have been more E & W than N & S. — In one case the mechanical yielding of the laminae, has determined it. —

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Citation: John van Wyhe, editor. 2002-. The Complete Work of Charles Darwin Online. (

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