RECORD: Darwin, C. R. [Humboldt] `Superposition'. CUL-DAR41.73 Transcribed by Kees Rookmaaker. (Darwin Online,

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? —

(b) Note

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°. —

1 Humboldt 1823, pp. 221-222. This item was miscatalogued by the CUL as a note on Humboldt's Personal narrative.

1 Cleaveland 1816.

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. (

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