sheet 2. Generalized altitude of ground-water levels in the Saddle Mountains Basalt -- sheet 3. Generalized altitude of ground-water levels in the Wanapum Basalt -- sheet 4. Generalized altitude of ground-water levels in the Grande Ronde Basalt.
Bibliography:
Includes text, bibliographical references, generalized lithologic column, and 2 ancillary maps: "Location of study area and geologic subprovinces" and "Generalized extents of occurrence of the basalt units underlying the project area."
Relief shown by contours and spot heights. Title from title screen (viewed Feb. 29, 2016). Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).