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Updated: May 27, 2025
The matter composing these three pseudo-dikes, especially the second one, appears to have suffered, like the surrounding strata, a certain degree of metamorphic action; and this has much aided the deceptive appearance.
In a letter to Mr. Brazil, Bahia, gneiss with disjointed metamorphosed dikes. Strike of foliation. Rio de Janeiro, gneiss-granite, embedded fragment in, decomposition of. La Plata, metamorphic and old volcanic rocks of. S. Ventana. Claystone porphyry formation of Patagonia; singular metamorphic rocks; pseudo-dikes. Falkland Islands, Palaeozoic fossils of.
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