RECORD: Darwin, C. R. 19 January-6 February [1833]. Speculations concerning Cleavage & stratification. CUL-DAR39.117. Edited by John van Wyhe (The Complete Work of Charles 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. Watermarked "RYE MILL 1830". See: Paper types used by Darwin during the voyage of the Beagle.


[117]

Speculations concerning Cleavage & stratification: [calculations]

The west slate, though dipping to the SSW is North of the WNW & SSE granitic range!!

At the junction E of N arm the roofing slate appeared to be upon the crystalline slate.

Foxes & mice at Navarin & Wollaston island:

Humboldt applies argument used about slate ─ to Navarin island: 1/4 1/8 .25

order of dip SS of cleavage on both sides Navarin island SSW NSE 5.5

[117v]

Jan. 19th.[1833] ─ (angle of interval ∠ 45˚)

N East end of horizon

cleavage dip to SSW about 80

run WNW & ESE

fissures run WSW & ENE

dip about same ∠

21 [January 1833] ∠ 78˚ 3/4 .25 N Shore of B Channel opposite ─ middle of Navarin

Chonos about 60 SSW

run WNW & WSE

fissure n by E & S by W

23d [January 1833] cleavage dips to S by W ∠50

runs W by N & E by S

1s set East entrance of Ponsonby Sound

{fissures dip NW by N ∠45

∠45˚ run NW by W .0 NE by E

fissures dip to E by S 1/2 S ∠87

∠84 1/2 125 run N by E 1/2 & S by W 1/2 W

Feb 6th [1833] 78 3/4 East shore of Ponsonby 78 ─

Cleavage dips  to SSW

run WNW & ESE

fissures dip to NW by W ∠65˚

runs SW by S & NE by N.


Return to homepage

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

File last updated 27 June, 2025