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Updated: June 22, 2025
Kent remarks that it superseded the schistose formation at the ravine we have noticed and that, subsequently, the sides of the hills became more broken, and valleys, or gullies, more properly speaking, very numerous. Captain Barker estimated the height of Mount Lofty above the sea at 2,400 feet, and the distance of its summit from the coast at eleven miles. Mr.
The lowest bed of a calcarous sericitic schist is four feet thick and underlies a bed of schistose lime stone six feet in thickness, which is in turn covered by a finely laminated phyllite, ten feet thick. The whole is capped by thirty feet of quartzite, which forms the top of a long ridge.
I had observed that the old schistose rocks on the sides dipped in toward the centre of the country, and their strike nearly corresponded with the major axis of the continent; and also that where the later erupted trap rocks had been spread out in tabular masses over the central plateau, they had borne angular fragments of the older rocks in their substance; but the partial generalization which the observations led to was, that great volcanic action had taken place in ancient times, somewhat in the same way it does now, at distances of not more than three hundred miles from the sea, and that this igneous action, extending along both sides of the continent, had tilted up the lateral rocks in the manner they are now seen to lie.
Sam, means 'when you hear, it shakes, signifying that the thunder reverberates from the heights owing to its steep side and gives it a tremulous motion. This abrupt, cliff-like side is the western, where the schistose gneiss is exposed for a thickness of 60 feet and more: the stone is talcose, puddinged in places with quartz pebbles, and everywhere showing laminations of black sand.
It is a spot whence lovers might easily step into eternity, were they so disposed, and the name fits delightfully into the wild and somber scene; but ask any good villager thereabout to relate the legend of the place and he will tell you this: About forty years ago a couple of young farmers went to the Leap which then had no name to pry out some blocks of the schistose rock for a foundation wall.
On the contrary, in addition to old granitic and other igneous rocks, all explorers find only either innumerable undulations of sandstones, schistose, and quartzose rocks, or such tufaceous and ferruginous deposits as would naturally occur in countries long occupied by lakes and exuberant jungles, separated from each other by sandy hills, scarcely any other calcareous rocks being found except tufas formed by the deposition of landsprings.
Under the microscope it is a confused mass of finely granulated minerals, with numerous included crystals. The rock has undergone complete metamorphism and its origin is unknown. 8 Phyllite-Near Otter Lake. A soft extremely fine grained gray rock, with a well developed schistose structure, carrying much magnetite, plagioclase, orthoclase and their alteration products.
These three parts are given dimensions that vary according to the composition of the different coals, and they may be made to use any sort of coal, even the fine and schistose kinds which would not be suitable for ordinary puddling.
It soon passed away, however, and left us well drenched, but the western horizon was still black with clouds. From this hill we proceeded to another, which at first sight I had thought was of volcanic origin, but proved to be like the first, of schistose formation, and was covered with low scrub. About 2 p.m. we had finished our work, and the sun shone out.
Pyrites dispersed in quartzose veins, crossing the mica-slate, are often auriferous, no doubt; but no analogous fact leads to the supposition that the sulphuretted iron which is found in the schistose marls of the alpine limestone, contains gold. Some direct experiments, made with acids, during my abode at Caracas, showed that the pyrites of Cuchivano are not auriferous.
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