Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 3, 2025
Does the Amazon-stone come from the rocks of euphotide, which form the last member of the series of primitive rocks?
The secondary formations on the east of the Havannah are pierced in a singular manner by syenitic and euphotide rocks united in groups. Going from north to south, and first near Marimelena, we find syenite consisting of a great quantity of hornblende, partly decomposed, a little quartz, and a reddish-white feldspar seldom crystallized.
The fine saussurite which we saw in the Upper Orinoco in the hands of the Indians, seems to indicate the existence of a soil of euphotide, superposed on gneiss-granite, or amphibolic slate, in the eastern part of the Sierra Parime. The Morros of San Juan rise like ruinous towers in a soil of diorite.
The island of Cuba, over more than four-fifths of its surface, is composed of low lands. The soil is covered with secondary and tertiary formations, formed by some rocks of gneiss-granite, syenite and euphotide. The knowledge obtained hitherto of the geologic configuration of the country, is as unsatisfactory as what is known respecting the relative age and nature of the soil.
The opinion that this stone is taken in a soft state like paste from the little lake Amucu, though very prevalent at Angostura, is wholly without foundation. A curious geognostic discovery remains to be made in the eastern part of America, that of finding in a primitive soil a rock of euphotide containing the piedra de Macagua.
The rocks chiefly relied on as evidence of this distribution consist of three varieties of granite, besides gneiss, chlorite-slate, euphotide, serpentine, and a peculiar kind of conglomerate, all of them foreign alike to the great Strath between the Alps and Jura and to the structure of the Jura itself.
Word Of The Day
Others Looking