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181023 results.

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Page 7094, results 177326 - 177350

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Not all publications have extents, not all extents are completely accurate
A new lepidolite deposit in Colorado
E.B. Eckel
1933, Journal of the American Ceramic Society (16) 239-245
A newly discovered pegmatite deposit near Ohio City, Colorado, is chiefly lepidolite, massive topaz, beryl, and albite, with some samarskite and columbitc. Three parallel pegmatite dikes, cach about 11 fect thick and 300 feet long, cut black schist. The minerals arc banded parallel to walls, with the following succession from walls to center; fine‐grained albite...
Specific yield determined from a Thiem's Pumping‐Test
L.K. Wenzel
1933, Eos, Transactions, American Geophysical Union (14) 475-477
The specific yield of a water-bearing formation is defined as the ratio of (1) the volume of water, which after being saturated, it will yield by gravity to (2) its own volume (O. E. Meinzer, Outline of ground-water hydrology, U.S. Geol. Sur. Water-Supply Paper 494, p. 28, 1923). It is...
Further remarks on the Cripple Creek Volcano, Colorado
G. F. Loughlin
1933, Eos, Transactions, American Geophysical Union (14) 243-243
Structural evidence, particularly in the deeper mine‐workings, indicates that the volcano, which is of Tertiary age, was developed by explosive eruptions at a number of points along intersecting fissure‐systems that had been formed in pre‐Cambrian granite by east‐west compression, probably during the Laramide revolution. The volcanic breccia, which consists principally of...
Volcanic history of the Magdalena District, New Mexico
A. H. Koschmann
1933, Eos, Transactions, American Geophysical Union (14) 250-250
The Magdalena District in central New Mexico comprises the Magdalena Range and Granite Mountain which are block mountains of the Basin Range type. They consist of Carboniferous sedimentary formations on a pre-Cambrian basement and are covered by Tertiary volcanic rocks.Volcanism in the District was preceded by considerable faulting, tilting, and...
Geophysical interpretation of ground‐water levels
O. E. Meinzer
1933, Eos, Transactions, American Geophysical Union (14) 36-37
The theory of rock‐pressure as a cause of artesian‐head dates back at least to early Grecian times. Thus the philosopher Thales, about 600 B.C., taught that the springs derive their water from the ocean through subterranean channels and that the water is lifted to the springs by rook‐pressure. The theory of rock‐pressure has had...
Some relations between ground‐water hydrology and oceanography
David G. Thompson
1933, Eos, Transactions, American Geophysical Union (14) 30-33
In many areas along the sea-coasts of the world the water-supply for human use is derived largely, and in some areas wholly, from underground sources. Because of the proximity to the ocean in these areas, in some respects the geologic and hydrologic conditions that govern the occurrence and movement of...
Deep‐well salinity‐exploration
A.G. Fiedler
1933, Eos, Transactions, American Geophysical Union (14) 478-480
One of the outstanding accomplishments of recent years in connection with the study of the geologic source of groundwater and the quality of water yielded by different formations has been the development of methods and equipment for the exploration of wells. The description and use of the deep‐well current‐meter on well‐exploration work in Hawaii and New...
Fluctuations of water‐surface in observation‐wells and at stream gaging‐stations in the Mokelumne Area, California, during the earthquake of December 20, 1932
Arthur M. Piper
1933, Eos, Transactions, American Geophysical Union (14) 471-475
On December 20, 1932, much of the western United States felt a pronounced earthquake‐shock which caused noticeable fluctuations of the water‐surface in several observation‐wells and at two stream gaging‐stations in the Mokelumne Area, central California. These effects of the earthquake are reported briefly in this paper.According to Dr. Byerly (personal...
Sources of ores of the ferroalloy metals
E. F. Burchard
1933, Journal of Chemical Education (10) 359-368
Since all steel is made with the addition of alloying elements, the record of the metallic raw materials contributory to the steel industry would be far from complete without reference to the ferroalloy metals. This paper, therefore, supplements two preceding arvicles on the sources of our iron ores. The photographs,...
The sources of our iron ores. II
E. F. Burchard
1933, Journal of Chemical Education (10) 288-296
In this instalment** the iron ore deposits of the Lake Superior States, which normally furnish about 80 per cent, of the annual output of the United States, are described together with historical notes on discovery and transportation of ore. Deposits in the Mississippi Valley and Western States are likewise outlined...