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use "sandstones " in a sentence
Erosion has resulted in the formation of natural arches in the massive sandstones of the Colorado Plateau.
Erosion has resulted in the formation of natural arches in the massive sandstones of the Colorado Plateau.
master Erosion has resulted in the formation of natural arches in the massive sandstones of the Colorado Plateau.
Silica 60•03 54•77 Alumina 14•91 28•61 Peroxide of iron 8•94 4•92 Lime 2•08 0•58 Magnesia 4•22 1•14 Potash 3•87 1•00 Soda - 0•24 Carbonic acid { 5•67 8•24 Water { -- -- 99•72 99•50 The sandstones are derived from the siliceous particles of granite and other rocks, and consist in many cases of nearly pure silica, in which case their disintegration produces a barren sand, but they more frequently contain an admixture of clay and micaceous scales, which sometimes form a by no means inconsiderable portion of them.
Such sandstones yield soils of better quality, but they are always light and poor.
In fact, the name given to each really expresses only the preponderating ingredient, and many sandstones contain much clay, shales and clay slates abound in lime, and limestones in sand or clay, so that it may sometimes be a matter of some difficulty to decide to which class they belong.
Of such impressions there are untold thousands upon these sandstones.
“In England, the Trias is the chief repository of salt, or chloride of sodium; and brine-springs, which are subterranean streams of water impregnated with salt from percolating through saliferous33 strata, are abundant in the great plain of the red marls and sandstones of Cheshire.
These scarcely need any special preservative process, but Kessler’s fluates are useful for the impregnation of weathered sandstones which are exposed to the open air (see p.
Other so-called sands and sandstones, though equally mechanical in their origin, are truly calcareous in their nature, and are more or less entirely composed of carbonate of lime.
Lastly, in certain rocks still finer in their texture than sandstones, such as the various mud-rocks and shales, we can still recognise a mechanical source and origin.
of over 20,000 feet, and is composed mainly of great beds of gneiss, altered sandstones (quartzites), mica-schist, hornblende-schist, magnetic iron-ore, and hæmatite, together with masses of limestone.
They are wholly metamorphic, and consist principally of altered sandstones or quartzites, siliceous, felspathic, or talcose slates, conglomerates, and limestones.
The Lower Cambrian is constituted at the base by a great series of grits, sandstones, conglomerates, and slates, which are known as the "Longmynd group," from their vast development in the Longmynd Hills in Shropshire, and which attain in North Wales a thickness of 8000 feet or more.
The Longmynd beds are succeeded by the so-called "Menevian group," a series of sandstones, flags, and grits, about 600 feet in thickness, and containing a considerable number of fossils.
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