RECORD: Darwin, C. R. n.d. Abstract of Arsène Isabelle, Voyage à Buénos-Ayres et à Porto-Alègre, par la Banda-Oriental, les missions D'uruguay, etc. CUL-DAR40.29. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 12.2021. 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.

Arsène Isabelle. 1837. Voyage à Buénos-Ayres et à Porto-Alègre, par la Banda-Oriental, les missions D'uruguay, etc. Havre.


[29]

Le Jacuy (near P. Alegre) rock Petrosilex points of quartz & Hornblende fusing easily.

Near Cacheira giès quartzeux argillifere with some Limestone all the high hills covered with pebbles –

R. Batucarahy fossil wood sandy clay with pebbles

sandy clay pebbles

Serra do Batucarahy thinks volcano from nature is form from saying they heard detonations I think from general native of country to the South. p. 455

Rio Pardo, clays including in the heights [illeg] with gros grains fortement cementes consider it a kind of sandstone, whole country formed of these beds.

 

[29v]

Pat Alegre p 479 –

Pymelite rosalie: "On voit, avec étonnement, sur la cime de ces hauteurs, d'énormes blocs de conglomérats (brèches), arrondis et durcis extérieurement par le frottement des eaux."

thinks they come from 3 leagues to East Gruss – variety of Pymelite with lay mica – at some league to East Porphyry Petrosiliceux brun [2 words illeg] masses of diorite are found in neighbourhood considers the porphyry as subordinate to other rocks – Abundant masses resulting from detrition of granitic rocks

 

Below Borja (near Ponjo) over for four [to] 500 leagues a stone even a single flint is as great a rarity as a diamond would be. The savages of these countries don't know what a stone is, & have not even a notion of it. It is diversion enough to see some of them, when they come to Borja & first rest with stones, express their admiration at them with Syms &


Return to homepage

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

File last updated 25 September, 2022