RECORD: Darwin, C. R. 7-8.1832. Geological diary: Rat Island / The Mount. CUL-DAR34.1. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Kees Rookmaaker, corrected and edited by John van Wyhe 10.2011. RN1
NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. This document, part of the largest scientific document composed by Darwin during the voyage of the Beagle, is written mostly in ink. See the Beagle diary pp. 199, 212.
Reproduced with the permission of the Syndics of Cambridge University Library and William Huxley Darwin.
See the introduction to the Geological Diary by Gordon Chancellor.
1
Rat island. 27th
Mica slate. — coarse granular
beds & cleavage running E by N
plans of fracture dipping to E SE (differing in contrary vary from schist) ∠ 12°. — there not regular even dipping SSW
containing in imbedded portions chloritic schist. these are penetrated by veins of quartz & mica. from which penetrated smaller much twisted vary most of granular quartz are sent off so that the whole schist is this entangled. (specimen 649). — I may observe that the schist has same planes of cleavage & fracture as mica slate, so that it is same formation. —
The Mount 28th —
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 25 September, 2022