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Updated: June 16, 2025
These veins, two or three inches thick, are distinguished by a fine-grained quartz-granite crossing a coarse-grained granite almost porphyritic, and abounding in fine crystals of red feldspar. I sought in vain, in the Cordillera of Baraguan, for hornblende, and those steatitic masses that characterise several granites of the Higher Alps in Switzerland.
The crest of this first main ridge and the surrounding mountains, with the exception of a few lofty pinnacles, are capped by a great thickness of a horizontally stratified, tufaceous deposit. The lowest bed is of a pale purple colour, hard, fine-grained, and full of broken crystals of feldspar and scales of mica.
Thirdly: a thick stratum of fine-grained, red, sedimentary matter, easily fusible into a white glass, like the basis of claystone porphyry; but in parts jaspery, in parts brecciated, and including crystalline specks of carbonate of lime.
Bed 11 is at least 800 feet in thickness: it consists of thin layers of whitish, greenish, or more commonly brown, fine-grained, indurated tuffs, which crumble into angular fragments: some of the layers are semi-porcellanic, many of them highly ferruginous, and some are almost composed of carbonate of lime and iron with drusy cavities lined with quartzf-crystals.
It is one of the noblest trees of the forest, rising, with its tall straight stem, to a great height, and adorned with large oblong pointed leaves, some of which are nearly a foot in length. It carries fruit which is eatable, about the size of a peach, and containing one or two stones; and the wood itself is valuable, being hard, fine-grained, and durable.
And it puts more into you, too, of fine-grained, steady strength, if you can stand the strain of it. And if, to the waiting is added perplexity, the pull upon your strength is much greater. It is harder to hold steady, and not break. And if the thing you've put your very life into seems at stake, that taxes the wearing power of your strength to the utmost.
The strata in this formation, composed of black calcareous shaly-rocks of red and white, and sometimes siliceous sandstone, of coarse conglomerates, limestones, tuffs, dark mudstones, and those singular fine-grained rocks which I have called pseudo-honestones, vast beds of gypsum, and many other jaspery and scarcely describable varieties, vary and replace each other in short horizontal distances, to an extent, I believe, unequalled even in any tertiary basin.
Finally he took out an idol of rather fine-grained, brownish-gray stone; the head was large and infantile, with the Mongolian cast of countenance; its badly shaped and scrawny arms were raised so as to bring the hands together on the chest; the body was shapeless.
Hard and fine-grained rocks, such as granite and quartzite, are often not only ground down to a smooth surface but are also highly polished by means of fine rock flour worn from the glacier bed. In other places the bed of the glacier is rough and torn.
In the upper and lower finer-grained strata, there were other concretions of a grey colour, containing calcareous matter, and so fine-grained and compact, as almost to resemble porcelain- rock: I have seen exactly similar concretions in a volcanic tufaceous bed in Chiloe. Gravel and boulders, 212 feet thick. b. Basaltic lava, 322 feet thick. c, d and e.
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