RECORD: Darwin, C. R. [Humboldt] `Superposition'. CUL-DAR41.73 Transcribed by Kees Rookmaaker. (Darwin Online, http://darwin-online.org.uk/).
REVISION HISTORY: Transcribed by Kees Rookmaaker, edited by John van Wyhe 3.2011. RN1
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Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin.
(a) Humboldt states (superposition &c p. 222) that on the road from Acapulco to Mexico, porphyries & coarse grained granites dip to the NW & the latter sometimes to SE.1
Does it hence appear probable that the two prevalent systems of the Americas intersect each other in Mexico? —
It is stated, in Cleveland's Geology of the United States, that the primitive formations are generally inclined to the SE at a greater angle than 45°. —
These notes refer to (a) and (b) on DAR41.73 recto.
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Citation: John van Wyhe, editor. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
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