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The Rôle of volatiles in the formation of Virginia titanium deposits

The feldspathic rock with which the titanium deposits of Virginia are associated appears to be an anorthosite, although the plagioclase is somewhat more sodic than in normal anorthosites. That is, this rock shows evidence of having been introduced as a mush‐like mass of crystals and intersititial magma, and of undergoing very thorough crushing during introduction. This rook was later very thorough
Authors
C. S. Ross

Relation of stream‐flow to ground‐water levels

In recent years the Water Resources Branch of the United States Geological Surrey has given considerable attention to the relation of ground‐water to stream‐flow. One locality in which this relation is being studied is about 13 miles from Washington, near Colesvllle, Maryland, where a Kinnison float‐gage is being maintained in a well In connection with the operation of a gaging‐station on the Nort
Authors
L.L. Harrold

A study of salt‐water encroachment in the Galveston Area, Texas

A survey of the ground‐water resources of the region in which Houston and Galveston are situated was started in December 1930 by the United States Geological Survey in cooperation with the Texas Board of Water Engineers. In connection with this survey a special study is being made of the geochemical relations of the ground‐waters of an area about 25 miles wide and 90 miles long, extending from Gal
Authors
Samuel F. Turner, Margaret D. Foster

Rare chemical constituents of amelia (Virginia) pegmatite dikes, and their mineral sources

Students of Igneous phenomena have long since become familiar with the occurrence of rare minerals in pegmatitic bodies. The great local concentration of rare elements in pegmatite minerals provides a remarkably good opportunity for the Investigation of deep-seated rock constituents, for it is reasonable to suppose that these same elements are widely distributed in minute amounts through the paren
Authors
Jewell J. Glass

Report of the committee on underground‐water, 1933–34

The by‐laws adopted at the meeting of the Section of Hydrology in 1933 provided that the membership of research committees should be reconstituted every three years. There have, accordingly, been some changes in the membership of the Committee on Underground‐Water. Certain members have retired because of pressure of other duties or because they are no longer actively engaged in ground‐water work.
Authors
D. G. Thompson

The transmission of pressure in artesian aquifers

The water in artesian aquifers is confined under pressure. Under ideal conditions in a perfectly rigid artesian reservoir a change of pressure in one part of the reservoir should produce a corresponding change of pressure in all other parts of the reservoir. Theoretically, the transmission of pressure should take place rapidly and without any movement of water other than the small amount resulting
Authors
R.M. Leggette, G.H. Taylor

Ablation of snow‐fields at high altitudes by radiant solar heat

Snow‐fields and the so‐called névés of glaciers on lofty mountains often present a peculiar, honeycombed appearance, the surface being pitted with deep cell‐like hollows a foot or two feet in diameter and from a few inches to several feet in depth. When typically developed these hollows are closely spaced, the divides between them consisting merely of attenuated blades and pinnacles of hard, granu
Authors
F. E. Matthes

Appendix A—permeability

In the paper entitled “The measurement of the permeability of porous media for homogeneous fluids” by R. D. Wyckoff and others [42] a unit of permeability is proposed which is based on centimeters, seconds, and atmospheres of pressure (76 centimeters of mercury).In 1923, when the Hydrologic Laboratory of the United States Geological Survey was organized, much study was given to the question of a c
Authors
O. E. Meinzer

Report of the committee on chemistry of natural waters, 1933–34

The personnel of this Committee during the past year, practically the same as during the previous year, has been as follows: C. S. Howard, Chairman—United States Geological Survey, Washington, D.C. L. C. Case—Gypsy Oil Company, Tulsa, Oklahoma. W. D. Collins—United States Geological Survey, Washington, D.C. H. F. Flynn—United States Engineer Office, 35 South Ninth Street, Philadelphia, Pennsylvani
Authors
C. S. Howard

Appendix C—A selected list of papers relating to ground‐water hydrology

In the following list brief statements have been added to certain references to call attention to special phases of ground‐water problems which are not apparent from the titles. Abstracts of most of these papers have been or will be published in the Annotated Bibliography of Economic Geology. 
Authors
A.N. Sayre

Appendix B—Lake and ground‐water levels

An outstanding achievement of the Section of Hydrology has been the work of the Committee on Glaciers in assembling the existing records of the advance and retreat of the glaciers in the Western States and in Alaska, encouraging various agencies in making periodic observations, systematizing and standardizing the work, and providing for the compilation and preservation of the data obtained from ye
Authors
O. E. Meinzer

Status of study of the frequency and magnitude of floods by the Mississippi Valley Committee of the Public Works Administration in collaboration with the United States Geological Survey

Active work under the recently authorized project relating to floods and their frequencies began in March, and such progress as may be reported at this time is largely that of organization and preliminary planning.One of the outstanding and impressive features of the organization is the provision for cooperative effort, whereby the mature judgment and possibly diverse viewpoints of various committ
Authors
Clarence S. Jarvis