RECORD: Darwin, C. R. Geological diary: very strongly: this elevation probably choked up C. Negro Isthmus. [1834] CUL-DAR34.197-198 Transcribed by Kees Rookmaaker, edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

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

Editorial symbols used in the transcription:
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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.


197

3

very strongly: this elevation probably choked up C. Negro Isthmus (same height with Elizabeth Island?)

Currents through the mountains being choked render this more probable. (anyhow it was an old channel & is now closed): The (N part) Sts of Magellan being drained by St Sebastian were not traversed by the main stream: hence the land allued was joined. —

Otherwise it must be a very great upheaval to choke up a channel when streams cut out deep channel. (in narrowest 62 fathoms). — Animals passed over; the currents eat a passage through from the S. Bay: (Proofs of inland bays. consuming cliffs). — X

197 verso

X. Fresh elevations raised land present height. —

[sketch]

How far are these lines of deposition in the coarsest part of beds in St of Magellan? —

198

4)

The advantage of this hypothesis is leaving the narrows always a channel. — for if they had once been joined, it is difficult to imagine the sea. could have eaten a passage: the sea can only, when guided by a valley eat in a large curvature: which makes the explanation 2. narrow difficult. — It would be wrong for the sake of hypothesis to neglect evidence of animals & correspondence of cliffs. —

198 verso

Elevations probably took place when. the 350 or 250 plain oozes from the sea. if the former, the sea must have been shallower than the coast of Pat; which is not probable: — Anyhow the anterior beds having been removed by strong currents through passages in the mountains: these were deposited at some epoch period

soil & some shells soon distributed over the gravel. —

T. del alluvium & high central alluvium of different ages —

Braker N 1620   Orozee, south later 970  
  S 1397   Sebastian C. 190  
Double Hill St Sebastian 290   do. 9 hill 950  
Elizabeth Isd 150        
Esp Santo 182        
H. Cliff S of do 250   E of C. Forward +/256 (1536)
C. Negro 160   SE of d W. Bay +/115 690
Narrow (1) S. Seb 120   down to P. St. Ann 110 - bottom 660
Orange Point 210        
High land s. of do (607)        
           
           

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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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