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Updated: June 5, 2025
Ice still stretches toward the land on the starboard side; but we don't care for it now the schooner's head is pointing E. and by S. At one o'clock we sight Amsterdam Island, about thirty miles on the port bow; then came the "seven ice-hills" as seven enormous glaciers are called that roll into the sea between lofty ridges of gneiss and mica slate, a little to the northward of Prince Charles's Foreland.
We remarked with surprise, that the natural damn over which the river is precipitated, presents a dry space of considerable extent; where we stopped to see the boat go up. The rock of gneiss exhibits circular holes, the largest of which are four feet deep, and eighteen inches wide.
"Gneiss rock for eleven hundred feet and then some mica schist that we have had to shore up every time we move our drills," answered Jack quietly. "Any cave-ins?" Morris was leaning forward now, his eyes riveted on the boy's. What information he wanted he felt sure he now could get. "Not yet, but plenty of water. "And when is he going to get through?" "That depends on what is ahead of us.
A few years hence this winter-garden will, with one exception to which we next proceed, be the main attraction at the Park. It will by that time be effectively supplemented by thirty-five surrounding acres of out-door horticulture, to which the soil of decomposed gneiss is well suited.
This breccia, or calcareous sandstone, is a local and partial formation, peculiar to the peninsula of Araya, the coasts of Cumana, and Caracas. We again found it at Cabo Blanco, to the west of the port of Guayra, where it contains, besides broken shells and madrepores, fragments, often angular, of quartz and gneiss.
Foliation may be used for those alternating layers or plates of different mineralogical nature of which gneiss and other metamorphic schists are composed. That the planes of foliation of the crystalline schists in Norway accord very generally with those of original stratification is a conclusion long since espoused by Keilhau. In Scotland, also, Mr.
Further north, however, to the west of this great range, there is no clay-slate, but only gneiss, mica, and hornblendic slates, resting on great barren hills of true granite, and forming a tract about sixty miles in width. Fitton in "Geological Proceedings" volume 1 page 29; also some observations by Captain Fitzroy "Voyages" volume 1 page 375. I am indebted also to Mr.
On leaving Guigue we began to ascend the chain of mountains, extending on the south of the lake towards Guacimo and La Palma. From the top of a table-land, at three hundred and twenty toises of elevation, we saw for the last time the valleys of Aragua. The gneiss appeared uncovered, presenting the same direction of strata, and the same dip towards the north-west.
As fast as we descended, the succession of beds forming the primitive foundation came out with increasing distinctness. Geologists consider this primitive matter to be the base of the mineral crust of the earth, and have ascertained it to be composed of three different formations, schist, gneiss, and mica schist, resting upon that unchangeable foundation, the granite.
The mountains connected on the east with the Rincon del Diablo, are much less lofty, and contain, like the promontory of La Cabrera, and the little detached hills in the plain, gneiss and mica-slate, including garnets. In these lower mountains, two or three miles north-east of Mariara, we find the ravine of hot waters called Quebrada de Aguas Calientes.
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