United States or South Sudan ? Vote for the TOP Country of the Week !
In its earlier and uninjured condition, this cavern opened upon a narrow plateau lying in front of it, and from which the rocky wall descended almost perpendicularly into the river. It could be reached, though with difficulty, from above. The uneven floor was covered to a thickness of 4 or 5 feet with a deposit of mud, sparingly intermixed with rounded fragments of chert.
"Trolldom!" croaked the voice of Olaf. "Chert!" This from Marakinoff. "What a space!" "Have you considered, Dr. Goodwin," he went on after a pause, "a curious thing? We know, or, at least, is it not that nine out of ten astronomers believe, that the moon was hurled out of this same region we now call the Pacific when the earth was yet like molasses; almost molten, I should say.
The limestone is sometimes changed in character by the proximity of the granitic mass or its veins, and acquires a more compact texture, like that of hornstone or chert, with a splintery fracture, and effervescing freely with acids.
There was nothing to reflect a glint of light except a collection of weapons of all ages which occupied the wall behind a bare stone hearth; suits of inlaid armour, coats of chainmail as flexible as silk, assegais and blowpipes, Bornean parangs and Gurkha kukris, Abyssinian shotels with their double blades, Mexican knives in chert and chalcedony, damascened swords and automatic pistols, a Chinese bronze drum, a Persian mace of the date of Rustum, and an Austrian cavalry helmet marked with a bullet-hole and a stain.
They are often altered into a kind of chert. At Muara there is an outcrop of coal seams twenty, twenty-five and twenty-six feet thick. The coal is of excellent quality, quite bitumenised, and not brittle. The beds are being worked by private enterprise. I saw no fossils, but the beds and the coal reminded me much of the older Australian coals along the Hunter river. The mines are of great value.
It contains a very few pebbles of quartz, and occasionally layers of chalcedonic nodules, like those of chert in our Greensand. From the pureness of this calcareous rock, it has been searched for in other places, but has never been found. From this circumstance, and from the character of the deposit, it was probably formed by a calcareous spring entering a small pool or narrow creek.
It would be natural to expect the fracture of solid rocks to take place chiefly where the bending of the strata has been sharpest, and such rending may produce ravines giving access to running water and exposing the surface to atmospheric waste. We must imagine that many strata of limestone, chert, and other rocks which are now brittle, were pliant when bent into their present position.
Peter's Mount, in the suburbs of Maestricht, abounds in corals and Bryozoa, often detachable from the matrix; and these beds are succeeded by a soft yellowish limestone 50 feet thick, extensively quarried from time immemorial for building. The stone below is whiter, and contains occasional nodules of grey chert or chalcedony. Mosasaurus Camperi. Hemipneustes radiatus, Ag. Spatangus radiatus, Lam.
At Jilmeca and some other points along the day's route the rock over which we passed was a white tufaceous material loaded with streaks of black flint. Sometimes this black flint passes into chert and chalcedony of blue and purple tints. Here and there, along the mountain sides, we caught glimpses of rock exposures, which looked snow-white in the distance.
In our wanderings, however, we picked up on Steamboat Point a beautiful red chert arrow-head, undoubtedly shot by an Indian at elk years before Columbus burst in upon these good people. In Hayden Valley we found an obsidian spear head, another sign that the Indian knew good hunting grounds. But no Indian was ever so anxious to meet grizzly as we were.
Word Of The Day