Publications

The Edwards limestone of Lower Cretaceous age is the principal water‐bearing formation in a belt 5 to 25 miles wide that extends from Austin southwest to San Antonio and thence west through Uvalde and Del Rio to Comstock, a distance of about 250 miles (see Fig. 1). Throughout this belt it supplies water to wells for stock, industrial, irrigation, and municipal use and to a series of fault‐springs,

The drainage‐basin of the Pecos River in New Mexico is a broad asymmetric trough extending from the Sangre de Cristo Mountains southward into Texas (see Fig. 1). It is bounded on the east by the westward facing escarpment of the High Plains and on the west by the crests of the Guadalupe, Sacramento and Sierra Blanca mountains, and a poorly defined divide extending northward through Gallinas Mounta

Storage of water in reservoir s may be for (1) irrigation, (2) power‐generation sometimes in connection with releases for irrigation, (3) flood‐control, (4) recreation, or combinations of these four uses. The control of releases of the stored water may involve conflicts of interests as to the best use of the available supply.

Sand‐waves on rivers are rhythmic successions of waves which occur at flood‐stages of streams heavily loaded with sediments. They take their name from the fact that sand and associated silts and gravels form a large part of the load transported by a river at such times. They seem to be peculiar to the Southwest and many vivid descriptions of them can be found in the literature of that region. R. C

So many ground‐water hydrologists are engaged on problems relating directly to the war that the usual annual inquiry for information as to projects that deserve review in the annual report of the Committee on Underground Waters brought relatively little response. It is in part for this reason, but also in part because the Chairman of the Committee is busy on war problems, that this report is short

The Boise River Project in southwestern Idaho comprises an area of about 333,000 acres of highly developed agricultural land. Precipitation in the irrigated valley averages about ten inches a year which is too low to support any but desert vegetation. Water for irrigation during the growing season is obtained from Arrowrock Reservoir located on the Boise River four miles above Moore Creek, and fro

This paper reports briefly on the runoff‐characteristics of the Santa Ynez River in Santa Barbara County, California, following the excessive rainfall in the winter of 1940–41; also, it contrasts these conditions of 1940–41 with earlier years of less rainfall. The data for this report were compiled in connection with an investigation of the water‐resources of Santa Barbara County which is being co

Geologists are concerned with the rock‐systems that form the crust of the Earth. The groundwater geologists are concerned with the rock‐systems specifically because the open spaces which the rocks contain serve as reservoirs and conduits for water—water which performs a large part of the geologic work that is in progress today and has been in progress during past ages; water which affects profound

The membership of the Committee during the past year was as follows: I. A. Dennison, National Bureau of Standards; C S. Howard (Chairman), Geological Survey; C. S. Scofield, Department of Agriculture; D. G. Thompson, Geological Survey; and T. G. Thompson, University of Washington, Seattle, Washington.SCOFIELD has continued his studies in connection with the salt balance in irrigated areas and has

The elongate stock of Ayer granodiorite exposed north and west of Lowell, Massachusetts, is reasonably typical of the many bodies of granitic rocks in the central and north‐central parts of the State. It lies within a terrane composed predominantly of steeply tilted, thinly inter bedded quartzite and biotite schist, and many of its structural relations superficially suggest for it a metasomatic or

The Lufkin Area, as the term is used in this paper, is comprised of Angelina and Nacogdoches counties, Texas, and parts of adjoining counties. Its surface is gently rolling, with a maximum relief of about 150 feet and a maximum altitude of less than 400 feet. The average annual rainfall is about 45 inches. Practically all of the water‐supplies in the area come from ground‐water and it has been fou

Veins carrying manganese silicates largely in the form of the manganese garnet, spessartite, occur in the crystalline schists and gneisses of Carroll and Grayson Counties, Virginia, in the southern parts of the Galax and Independence quadrangles just north of the North Carolina State line. This brief paper includes a discussion of these manganese-bearing veins which are described in a report on th