Abstract
A VERY cursory examination of the gneiss rocks about Rio de Janeiro—particularly the Corcovado—will show how the rock breaks up. In some places it comes off in great flakes like the coats of an onion, and the edges of these flakes are quite friable, and can be reduced to fine grains between the fingers. In many places it is found quite crumbled up by the weather, and down the coast towards Santos fine grains of these rocks can be found in the soundings at some distance from the land.
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BARKER, D. The Glaciation of Brazil.—Scintillation of Stars. Nature 48, 614 (1893). https://doi.org/10.1038/048614b0
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DOI: https://doi.org/10.1038/048614b0
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