RECORD: Darwin, C. R. Geological diary: The Cliffs are continued up to the Altos of old Tucapel. [2.1835] CUL-DAR35.350 Transcribed by Kees Rookmaaker, edited by John van Wyhe (Darwin Online,

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

NOTE: This document, part of the largest scientific document composed by Darwin during the voyage of the Beagle, is written mostly in ink. Marginal notes are here integrated into the text.

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

See the introduction to the Geological Diary by Gordon Chancellor.


The cliffs are continued up to the Altos of old Tucapel. — about 10 miles to the South & in the interior there is a high range of mica slate. —

P. Rumena & Lavapie. — Between these points for a length of about 8 miles, the land which had formed even plains, became [southern] higher & much broken: The cliffs were of same constitution, but the strata, instead of being horizontal, were all inclined at ∠ 40° to about from SSE to S — They were very even — Three principal ridges were thus composed which might be traced someway in the country — There were others less apparent. I think at least 8 or 9 lines of elevation. — On the east extremity

350 verso

of this E & W band of disturbance, the strata were less incline not more perhaps than 20° — There was no trace of anticlinal dip. — There is clearly an analogous case with that of Chiloe. We see in the tertiary period bands of upheaval have both run N & S & E E W. in like manner as grand the secondary E & W mountain chains have been shown to do (between Andes & Pacific): — The form surface of land I have said entirely follow follows in its shape these lines of elevations:

it is also remarkable as clearly forming the this most projecting headland part of the coast. — In this respect also it is fact we have also seen it on the Isd of S. Maria. — All tertiary. —

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

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