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Updated: May 31, 2025
The one block of greenstone, moreover, on the northern island must be excepted. These were first read before the Geological Society in May, 1837, and have since been developed in a separate volume on the "Structure and Distribution of Coral Reefs." It is remarkable that Mr.
The prevailing rock is gneiss, often passing, by the disappearance of the quartz and mica, and by the feldspar losing its red colour, into a brilliantly grey primitive greenstone. Not unfrequently quartz and hornblende are arranged in layers in almost amorphous feldspar.
One boulder in particular had had its origin in a valley where rounded fragments of water-washed greenstone had been poured out by the torrents and frozen into the coast-ice of the belt. The attrition of subsequent matter had truncated the great egg-shaped rock, and worn its sides into a striated face, whose scratches still indicated the line of water-flow."
The summit of the mountain is broad and flat, and is composed of huge angular masses of naked greenstone. Its elevation is 3100 feet above the level of the sea.
I showed this specimen to an experienced geologist, and asked him what it was; he answered, as I think every one else would have done, that it was a primitive greenstone. These five varieties, with many intermediate ones, pass and repass into each other. As the compact varieties are quite subordinate to the others, the whole may be considered as laminated or striped.
Greenstone surely cannot mean that the question of a 'personal Messiah' is a mere detail of the belief. Yet it is on that point that opinion is most divided among Jews. The older belief undeniably was what Dr. Greenstone enunciates. But for this belief, none of what Mr.
The rock is of trap, greenstone, or whinstone, which miners call iron-stone and Cornishmen 'blue elvan: this diorite, composed of felspar and the hardest hornblende, contains granular iron and pyrites like silver. We find the same trap on the mainland. From the surf-boat we remarked that there were no sharks; apparently they shun coming within the reefs.
We find at the back of this granitic, or rather mica-slate-gneiss soil of the southern chain, on the south of the Villa de Cura, a transition stratum, composed of greenstone, amphibolic serpentine, micaceous limestone, and green and carburetted slate. The most southern limit of this district is marked by volcanic rocks. According to the observations of Major Long and Dr.
The southern part of Wollaston Island and the whole of Hermite and Horn Islands, seem formed of cones of greenstone; the outlying islets of Il Defenso and D. Raminez are said to consist of porphyritic lava. Brooke's Paper in the "London Philosophical Magazine" volume 10. No recent volcanic district has been observed in any part of Tierra del Fuego.
Wherever these slaty feldspathic rocks abound, greenstone seems common; at the C. of Quillota a bed of well-crystallised greenstone lay conformably in the midst of the feldspathic slate, with the upper and lower junctions passing insensibly into it.
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