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Specific yield determined from a Thiem's Pumping‐Test
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 a measure of the quantity of water that a formation will yield when it is drained by lowering of the water-table.
Authors
L.K. Wenzel
Further remarks on the Cripple Creek Volcano, Colorado
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 phonolitic material, appe
Authors
G. F. Loughlin
Volcanic history of the Magdalena District, New Mexico
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 uplifting very probably in early Tertiary time. The
Authors
A. H. Koschmann
Geophysical interpretation of ground‐water levels
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 a number of recent advocates, chief among whom was the British geolog
Authors
O. E. Meinzer
Some relations between ground‐water hydrology and oceanography
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 ground-water are quite different from those in inland areas, and to properly interpret them the
Authors
David G. Thompson
Deep‐well salinity‐exploration
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 Mexico has already appeared in published li
Authors
A.G. Fiedler
Appendix B—investigations of underground‐water problems in California, New Mexico, and Oregon
Investigations by the California Department of Public Works, Division of Water Resources (based on written communication from Harold Conkling, Deputy State Engineer)—the Division of Water Resources, California Department of Public Works, has in the past year conducted investigations of ground‐water problems in the great central valley of the State (California Trough); in the Salinas and Santa Clar
Authors
Arthur M. Piper
Fluctuations of water‐surface in observation‐wells and at stream gaging‐stations in the Mokelumne Area, California, during the earthquake of December 20, 1932
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 communication, February 9, 1933), in charge
Authors
Arthur M. Piper
Notes on the relation between the moisture‐equivalent and the specific retention of water‐bearing materials
The moisture‐equivalent and specific retention have been widely used as quasi‐physical constants to measure the power of a water‐bearing material or a soil to retain water against gravitative force. Comparatively little has been demonstrated, however, as to the relation of one to the other. This paper is a preliminary statement of the apparent relation between these two measures of retentive power
Authors
Arthur M. Piper
Silver and bismuth-bearing galena from Leadville
No abstract available.
Authors
E. Chapman, R. E. Stevenson
A method for permanently recording the locations of objects on microscope slides
No abstract available.
Authors
K. E. Lohman