Add this copy of Geohydrologic Framework of the Snake River Plain to cart. $75.00, good condition, Sold by Ground Zero Books, Ltd. rated 4.0 out of 5 stars, ships from Silver Spring, MD, UNITED STATES, published 1992 by United States Government Printing Office.
Publisher:
United States Government Printing Office
Published:
1992
Language:
English
Alibris ID:
15980302704
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Seller's Description:
Good. vi, 32 pages. Oversized book, measuring 11-1/2 inches by 9 inches. Institutional stamp and ink notation on title page. Tables. Includes Abstract, Introduction, Well-numbering system, Geologic history, Origin of the Snake River Plain, Structure, Stratigraphy, Areal distribution and description of rocks, Application of surface geophysical methods to subsurface hydrogeologic mapping, Areal extent and lithology of the Snake River Plain regional aquifer system, Hydraulic characteristics of Quaternary basalt and alluvial aquifers, Geologic controls on ground-water movement, Summary, and References cited. Includes 6 full-color Geological Maps of the Snake River Basin, Idaho and Eastern Oregon (each measuring 21-1/2 inches by 3 feet 2-1/2 inches laid into a pocket inside the back cover). The Regional Aquifer-System Analysis Program (RASA) was started in 1978 following a congressional mandate to develop quantitative appraisals of the major ground-water systems of the United States. This program represents a systematic effort to study a number of the Nation's most important aquifer systems, which in aggregate underlie much of the country, and which represent an important component of the Nation's total water supply. The Snake River Plain in southern Idaho is a major geologic structure of uncertain origin. Subsurface geology is poorly defined below about 500 feet. Rocks that underlie the plain form the framework for a regional ground-water system that supplies large quantities of water for irrigation and makes the plain nationally important in terms of agricultural production. The 15, 600-square-mile Snake River Plain is a grabenlike structure that formed in middle Miocene time. The oldest known rocks underlying the plain, penetrated in a 14, 007-foot-deep test hole northwest of Boise, are of middle Miocene age. Miocene volcanic rocks at the plain's margin that dip toward and underlie the plain were highly faulted and severely eroded before the plain was formed. Faults along the margins of the eastern part of the plain are not visible at land surface and have been defined chiefly by geophysical methods. However, well-defined fault systems bound the western part of the plain. Geophysical data and drillers' logs indicate that Quaternary basalt in the central part of the eastern plain is as much as 5, 000 feet thick. A test hole about 10 miles northeast of the Snake River near Wendell provided the first information about deep subsurface stratigraphic relations in that part of the plain. The stratigraphic sequence penetrated in the test hole is similar to that in the north wall of the Snake River canyon between Milner and King Hill. The western plain is underlain mainly by unconsolidated and weakly consolidated Tertiary and Quaternary sedimentary rocks as much as 5, 000 feet thick. Basalt also is present in the western plain and is most extensive near Mountain Home. Quaternary basalt of the Snake River Group, which composes much of the Snake River Plain regional aquifer system, is highly transmissive. In the eastern plain, a thick sequence of thin-layered basalt flows yields large volumes of water to wells. Wells open to less than 100 feet of the aquifer yield as much as 7, 000 gallons per minute; yields of 2, 000 to 3, 000 gallons per minute with only a few feet of drawdown are common. Transmissivity commonly exceeds 100, 000 feet squared per day and, in places, 1 million feet squared per day. In 1980, ground-water discharge between Milner and King Hill, largely spring flow, averaged about 6, 000 cubic feet per second. In the western plain, coarse-grained sedimentary deposits are thickest and transmissivity is highest along the northern mar-gins. Across most of the plain, Quaternary basalt aquifers overlie aquifers in the Tertiary Idavada Volcanics and Banbury Basalt of the Idaho Group. Faults and fractures are permeable zones for water storage and conduits for movement. The Idavada Volcanics contains important...
