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Dr. Koenig has placed in the British Museum, beside the syenites of the Congo, the granites of Atures, taken from a series of rocks which were presented by M. Bonpland and myself to the illustrious president of the Royal Society of London. "These fragments," says Mr.
«Nous avons dit précédemment que c'étoit entre Orfière et Liddes que nous avions vu les derniers granites roulés, on n'en rencontre plus dans tout le reste de la route jusqu'au haut du Mont St. Bernard. Les rochers qui dominent ce sommet ne sont pas composés de granites, et quoiqu'on ne puisse aborder jusqu'
Beyond it lay the foot-hills of gloomy trap leading to the Jebel el-Raydan, a typical granitic form, a short demi-pique saddleback with inwards-sloping pommel like the Pao d'Assucar of picturesque Rio de Janeiro. Here as elsewhere, the granites run parallel with and seaward of the traps.
The rock on both sides of the lode is gold-bearing, and is evidently, as well as the real lode, formed of the debris of old quartz and granites. Talcose flakes are frequent, and in some places it seems to be clearly gneiss.
About the dome is written, "Thou art Peter, and upon this Rock I will build my Church," in letters of gold Rome's ultimate authority. All is square and solid and heavy. There are no seats, but the extensive floor is of varying granites and marbles, on which those who believe kneel, and look so small, smaller than life-size in the presence of the thrice-magnified statues of the Popes.
From this example we may learn how impossible it is to conjecture whether certain granites in Scotland, and other countries, which send veins into gneiss and other metamorphic rocks, are primary, or whether they may not belong to some secondary or tertiary period.
The granites of the Orinoco, it is true, often contain hornblende; and those who are accustomed to practical labour in mines are not ignorant that the most noxious exhalations rise from galleries wrought in syenitic and hornblende rocks: but in an atmosphere renewed every instant by the action of little currents of air, the effect cannot be the same as in a mine.
M. Necker has proposed to call the granites the underlying igneous rocks, and the distinction here indicated is highly characteristic. It was, indeed, supposed by some of the earlier observers that the granite of Christiania, in Norway, was intercalated in mountain masses between the primary or palaeozoic strata of that country, so as to overlie fossiliferous shale and limestone.
When the trolley car reached this height Miss Church-Member at once fixed her eyes on the ponderous pillars on each side of the converging corridors, for she knew that more than four thousand feet of the tower's amazing weight rested on these defiant granites. Mr.
Relation between movements of subsidence and volcanic action. Pampean formation. Recent elevatory movements. Long-continued volcanic action in the Cordillera. Conclusion. I have already described the general nature of the rocks in the low country north of Valparaiso, consisting of granites, syenites, greenstones, and altered feldspathic clay-slate.
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