RECORD: Darwin, C. R. Geological diary: East coast of T. del Fuego & Sts of Magellan. CUL-DAR34.190-191 Transcribed by Kees Rookmaaker, edited by John van Wyhe (Darwin Online,

REVISION HISTORY: Transcribed by Kees Rookmaaker, corrections and editing by John van Wyhe 4.2011. RN2

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.



I feel convinced that Gregory Bay, C. Monmouth, [Freshwater] bays are of the Patagonian form: proofs elevation, outliers & improbability of the low intervening beds. having such an elevation: a probable termination of Patagonia:

(Perhaps, Table Mountain, Orosco do.) — They are probably same nature as old alluvium, perhaps covered by new alluvium: hence trees: — proximity climate & detritus. —

Upon elevation, C. Monm. island: Freshwater range, protected by Brunswick peninsula: Gregory. Beagle hills. termination. Patagonia: during elevations with more open seas.

every thing was removed (no vestiges of 350 cliff). Elevation caused western barriers. deposits commenced.

190 verso

The 350 elevation cause of inequalities

deeper. sea from facing straits

in a direct line


(2 2

When 350 cliff was beneath sea & shells & earth scattered on its surface, these recent beds were formed x. & began to be shortly elevated at same time.

They were not deposited tranquilly: coarse deposits facing old straits: tranquil behind C. Monmouth tranquil, facing St. Sebastian rough. — behind slate tranquil: — during the first (& all) elevation surface much furrowed (different from Patagonia) especially in the channels. not as much about C. Virgins. —

From range of land I conjecture main channel was at this period through Otway water: —

the Sts of Magellan

probably but a shoal one. (or not much current) An elevation (a large one) joined Elizabeth Island &c. when appearance. point out this

191 verso

East coast of T. del Fuego & Sts of Magellan

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File last updated 2 July, 2012