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Surficial geology, structure, and thickness of selected geohydrologic units in the Columbia Plateau, Washington

Water-Resources Investigations Report 84-4326

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Abstract

A 2-1/2 year study of the Columbia Plateau in Washington was begun in March 1982 to define spatial and temporal variations in dissolved sodium in the Columbia River Basalt Group aquifers and to relate these variations to the groundwater system and its geologic framework. This report describes the geologic framework , including the vertical and areal extent of the major basalt units, interbeds, and overlying materials. Thickness and structure of the Grande Ronde, Wanapum, and Saddle Mountains Basalts, thickness of the interbeds between the Grande Ronde and Wanapum, and Wanapum and Saddle Mountains Basalts, and thickness of the overburden were mapped at a scale of 1:500,000. Information was compiled from 2,500 well records using chemical analyses of core or drill chips, geophysical logs, and driller 's logs, in decreasing order of reliability. Surficial geology and surficial expression of structural features were simplified from published maps to provide maps with this information at the 1:500,000 scale. This report is intended to serve as a base for evaluating the distribution of dissolved sodium in basalt aquifers and as a base for future water resource studies. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Surficial geology, structure, and thickness of selected geohydrologic units in the Columbia Plateau, Washington
Series title:
Water-Resources Investigations Report
Series number:
84-4326
Edition:
-
Year Published:
1986
Language:
ENGLISH
Description:
10 maps and 1 data sheet : col. ; 60 x 79 cm., on sheets 76 x 91 cm., folded in envelope 30 x 24 cm.