A Reprint of Annual Reports and Other Papers on the Geology of the Virginias

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D. Appleton, 1884 - Geology - 832 pages
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Page 713 - and then suddenly brought down again to the floor; the air under it being by this means propelled, will pass along, till it escapes at the opposite side, raising the cloth in a wave all the way as it goes. In like manner, a large quantity of vapor may
Page 835 - Red Sandstone.—A series of sandy, argillaceous, and often calcareous strata, the predominant colour of which is brick-red, but containing portions which are of a greenish grey. These occur often in spots and stripes, so that the series has sometimes been called the variegated sandstone. The European formation so called lies in a geological position immediately above the coal measures.
Page 835 - Petroleum.—A liquid mineral pitch, so called because it is seen to ooze like oil out of the rock. Pisolite.—A stone possessing a structure like an agglutination of peas. Pit Coal.—Ordinary coal; called so because it is obtained by sinking pits in the ground. Pitch Stone.—A rock of a uniform texture, belonging to the
Page 837 - Silt.—The more comminuted sand, clay, and earth, which is transported by running water. It is often accumulated by currents in banks. Thus the mouth of a river is silted up when its entrance into the sea is impeded by such accumulation of loose materials.
Page 837 - Stalagmite.—When water holding lime in solution drops on the floor of a cavern, the water evaporating leaves a crust composed of layers of limestone: such a crust is called stalagmite. Stilbite.—A crystallized simple mineral, usually white, one of the Zeolite family, frequently included in the mass of the Trap rocks. Strata,
Page 832 - Fault, in the language of miners, is the sudden interruption of the continuity of strata in the same plane, accompanied by a crack or fissure varying in width from a mere line to several feet, which is generally filled with broken stone, clay, &c.
Page 830 - or trough, formed of older rocks, sometimes used in geology almost synonymously with "formations," to express the deposites lying in a certain cavity or depression in older rocks. Bitumen.—Mineral pitch, of which the tar-like substance which is often seen to ooze out of the Newcastle coal when on the fire, and which makes it cake, is a good example.
Page 525 - field, and separated by about three miles of primary rocks, lies the small coal tract, known as the Springfield and Deep Run basin. It is about two miles in length and a quarter of a mile in width, its most southern termination being near Deep Run church, its most northern a short distance south of Chickahominy river. CHAPTER

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