RECORD: Darwin, C. R. [1832].12.28. [Hermit island] Rock has sonorous decomposing white externally in large angular fragments. CUL-DAR39.122. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin.
[122]
Rock has sonorous decomposing white externally in large angular fragments.─ parallel line of cleavage run ENE & WSW─ in a conical peak─ consecutive by ridges E 1/2 N W 1/3; I should think phonolitic rather than greenstone─
Hornblende & feldspar crystalline a various proportion:
On bottom of hills ─
916: 917 commonest marl with pyrites
918 much Hornblende firm grained
919 much [illeg] in [illeg] crystal & hornblend [illeg] : Turn of Kater peak
920 ─ less marked crystals ─ from very summit of Kater peak & probably surrounding cour
[few words illeg]
[122v]
Examine texture of aluminium Limestone
921 ─ Piece of impure formation with much Iron resembling [haesurite] of Plymouth in fragment on beach Wigwam cove ─ : in considerable quantities
some few Aularch Beech
nearly the same algren plants: ?? (What angle does Kater peak subtern Wigan Cove??
Decr 28th ─ Jerdan Island & Northern parts of Hermit Island Greenstone in the lower parts the rocks have by far most & most regular cleavage even so as to become slaty hills, all conical with curved sides; specimens decompose externally reddish brown: = Mr Sorrell says [Meanes] & Pumice Sandwich land. Mr. Weddell in S. Shetland Tales ─ Read & Ask
["Sorrell, Thomas, 1797-? Was on all three Beagle voyages. 1832 Jul. Acting Boatswain on 2d voyage of the Beagle." Paul van Helvert & John van Wyhe, Darwin: A Companion, 2021, p. 401.
James Weddell, 1825. A Voyage Towards the South Pole: Performed in the Years 1822-24, etc. London.]
[122a]
The whole of Hermit Island in characters by their peaks: one necessarily attribute their origin at first sight to something different from the neighbouring rocks at Wollaston Island with its castellate summit
Find out general soundings amongst the Hermit Islands & the external bank mentioned by Cap FitzRoy; The outer rocks as at False Cape Horn, much weathered: but the inlets although exposed in a direct line to the open ocean yet does not young show that waves do not enter deeper water always very smooth:─
The resemblance of the summit of Katers peak is its chemical constitution much resembles Phonolite (as Ter Noronha) no less in its sonorous & tough properties: its numerous cleavage & its isolated peaks.─ it is a fine transition from one to,─ other rocks:─
[122av]
= From Captains views no slate on the outer coast ─ & till better information it will be best to conclude the whole W [illeg] as primitive & of separate origin form by Hermit group= Diego Ramirez
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022