The Occurrence and Distribution of Corundum in the United States,

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U.S. Government Printing Office, 1901 - 98 Seiten
 

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Seite 161 - A sandstone post 34 by 7 by 7 inches, sunk 33 inches in the ground in the center of top of which is cemented a bronze triangulation tablet marked "US Geological Survey — Pennsylvania.
Seite 60 - A sandstone post 36 by 6 by 6 inches set 33 inches in the ground in the center of top of which is countersunk and cemented a bronze triangulation tablet, "Ohio.
Seite 90 - A marble post 36 by 6 by 6 inches, set 32 inches in the ground, in the center of top of which is countersunk and cemented a bronze triangulation tablet. (Latitude, 40° 21
Seite 105 - A stone post 42 by 10 by 10 inches set flush with surface of ground, in the center of top of which is cemented a bronze tablet marked " IT. S. Geological Survey — Pennsylvania." [Latitude 39
Seite 239 - Bulletins, and Water-Supply Papers treat of a variety of subjects, and the total number issued is large. They have therefore been classified into the following series: A, Economic geology; B, Descriptive geology; C, Systematic geology and paleontology; D, Petrography and mineralogy; E, Chemistry and physics; F, Geography; G, Miscellaneous; H, Forestry; I, Irrigation; J, Water storage; K, Pumping water; L, Quality of water; M, General hydrographic investigations; N, Water power; O, Underground waters;...
Seite 16 - ... held in solution in the molten mass of the peridotite when it was intruded into the country rock, and that it separated out among the first minerals as this mass began to cool.
Seite 140 - Station mark: A sandstone post 42 by 8 by 8 inches, set 30 inches in the ground, in the center of the top of which is cemented a bronze tablet marked " US Geological Survey — Pennsylvania.
Seite 61 - produced by a succession of compressive stresses applied in different directions, chiefly from east to west and from north to south."2 In accounting for the fissures of the Telluride quadrangle, Purington3 arrived at somewhat similar conclusions.
Seite 51 - RAY, ON LINE BETWEEN FULTON AND BEDFORD COUNTIES. On Ray's mountain, about 5 miles north of Pennsylvania-Maryland State line, and 2 miles west of Anaranth, Pa., on high knob in cleared field. Station mark: A stone post, 42 by 8 by 8 inches, set flush with surface of ground, in the center of top of which is cemented a bronze tablet marked "US Geological Survey — Pennsylvania.
Seite 16 - ... would cool first. Convection currents would then tend to bring a new supply of material carrying alumina into this outer zone, and when this zone was reached, crystallization would take place and the alumina would be deposited as corundum.

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