RECORD: Darwin, C. R. [10.2.1833]. N of Orange Bay (Tierra del Fuego). CUL-DAR39.121. 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. Corrections and further editing by John van Wyhe 2024. RN2

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. Cream-coloured wove paper.

Darwin, Beagle diary, p. 300: "Sunday 10th [February 1833] Removed to a bay North of Orange Bay. —"
The bay to the north of Orange Bay (or Orange Harbour in some Beagle documents) on the Hardy Peninsula was called Scotchwell Bay on the chart: 'Part of Tierra del Fuego' in Narrative 2.


[121]

975 Feldspathic rock N of Orange Bay

1013 yellow & common

1014 Green & tender & rare [illeg]

1015 & 16. fine greenstone Hornblende, not conchoidal fracture with spots of feldspathic rock white span & [illeg] when Hornblend does not exist

17 18 slaty sandstone, black grey coloured ─ contains numerous opake white crysts drusy cavities ─ & [whiting] mingled with some minerals & as to be fusible

19 Hard compact crystalline feldspathic rock

20 Earthy red porphyry ─ white specks ─ markings purple of claystone ─

All these occurred in a hill above the greenstone

[The bottom 1.5cm of the page has been excised with scissors. There is a small trace of red sealing wax at the corner.]

[121v]

in W by S ─ come after meeting slate & feldspathic & rocky like (755) came to this hill ─ surface flat covered with pigments curiously paved S snow softening ground like Macadam a little to the south when all the singular trappean rocks before described:

= In Trappean hills compass of no use

[121a]

N. of Orange bay

Crossing the peninsula in a W by S course we f meet with good slate & feldspathic rocks.─ On the west coast there is a remarkable hill, the lower part is composed of a fine grained hornblendic rock, with yellowish white spaces where little there are no crystals of hornblende: 1015 & 16 fracture conchoidal.─ the flat summit of several varieties of rock. One is a slaty sandstone (1017. & 18) coloured blackish grey.─ with containing in drusy cavities small opake white crystals.─ the rock however from a mixture of some other mineral is fusible.─ the beds dip at about ∠ 25˚ to the SW by S.─ That is nearly the same as the usual slate ─ Must we not suppose the hornblende rock to be slate altered.─ Together with the slate is a sonorous 1019 brittle pællucid feldspathic rock: angular cleavage

[121av]

also a 1020 red porphyry.─ when the base & white specks are earthy

all these rocks are fusible: About 2 miles to the south of this hill is the trappean formation before mentioned & is evidently the nearly the very last place where stratification is visible (NB. the slaty sandstone shows tendency to form quadrangular columns).─ This hill is fol  lofty though inferior the N. Slaty range─ the surface is covered with small fragments: & these are arranged so regularly (& yet on a slope): as to make one believe they were deposited under water: ─ I found the cause to be the gradual melting of snow, softens the ground so completely as to allow the stone to imbed themselves:


Return to homepage

Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 4 January, 2025