RECORD: Darwin, C. R. 19 January-6 February [1833]. Speculations concerning Cleavage & stratification. CUL-DAR39.117. 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. Watermarked "RYE MILL 1830".


[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.


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

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