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Isabelle Voyage

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 ashore with gros grains fortement cementés considers it a kind of sandstone, whole country formed of these beds.—

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Port Alegre p 479 —

Pegmatite rosatre: "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 Gneiss — variety of Pegmatite with layer of mica — at some leagues to East Porphyry Petrosiliceux brun rougeâtre clair 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 or 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 meet with stones, express their admiration at them with signs &

Isabelle, Arsene. 1835. Voyage a Buénos-Ayres et a Porto-Alègre, par la Banda-Oriental, Les Missions d'Uraguay et la Province de Rio-Grande-do-Sul (de 1830 a 1834). Le Havre: J. Morlent.

La Condamine, Charles Marie de. 1747 A succinct abridgment of a voyage made within the inland parts of South America. London. See Red notebook, p. 56.