Bulletin - United States Geological Survey, Temas65-71

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Página 36 - This stratum is the only one of the series" that is generally conglomeratic or contains quartz pebbles larger than coarse sand grains. On account of this peculiarity, the rock in question becomes a very important guide to the geologist in the interior of West Virginia, where so many of the Dunkard coals and limestones have disappeared, for it retains its pebbly character over a very wide area. When at its greatest development, the thickness of this stratum approaches 75 to 100 feet. It is usually...
Página 6 - VI. General awakening of sleepers ; general ringing of bells ; swinging of chandeliers ; stopping of clocks ; visible swaying of trees : some persons run out of buildings ; window-glass broken. "Severe;" '" very severe;
Página 33 - It is always a multiple bed, being separated Into two or three layers by divisions of slate. Occasionally these divisions are numerous and the entire thickness of the bed is 8 to 10 feet, but in all cases the only pure or merchantable coal is the bottom portion, which seldom exceeds 2% to 3 feet.
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