RECORD: Darwin, C. R. [1833.02].  N of Orange Bay. 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. 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.

Darwin, C. R. [Beagle diary (1831-1836)]. EH88202366, p. 300: "Sunday 10th Removed to a bay North of Orange Bay. —"


[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 doe not exist

17 18 slaty sandstone, black grey coloured ─ [circular] run opake white [crysts] along cavities ─ & [uniting] mingled with some minerals & as to be fusible

19 Hard compact crystalline feldspathic rock

20 Early red porphyry ─ white specks ─ marking plain of [illeg] ─ All these occurred in a hill above the greenstone

[121v]

[illeg] W by S ─ come after meeting slate & feldspathic & rocky like (755) came to this hill ─ surface flat covered with pigments curiously paved S snow [illeg] ground like Made 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. On[e] is a slaty sandstone (1017 & 18) coloured blackish grey─ with containing in [dung] 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 1018 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, soften the ground so completely as to allow the stone to inbed themselves:


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

File last updated 25 September, 2022