ABSTRACT
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 – Clay stone porphyry formation of Patagonia; singular metamorphic rocks; pseudo-dikes – Falkland Islands, palaeozoic fossils of – Tierra del Fuego, clay-slate formation, cretaceous fossils of; cleavage and foliation; form of land – Chonos Archipelago, mica schists, foliation disturbed by granitic axis; dikes – Chiloe – Concepcion, dikes successive formation of – Central and Northern Chile – Concluding remarks on cleavage and foliation – Their close analogy and similar origin – Stratification of metamorphic schists – Foliation of intrusive rocks – Relation of cleavage and foliation to the lines of tension during metamorphosis.
