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Age Formation Sedimentary Interbed Aquifer Unit Holocene and Pleistocene Loess, alluvial, lacustrine, and glacial flood deposits Alluvial Aquifer Rattlesnake Ridge Selah Wanapum Aquifer Miocene Saddle Mountains Basalt Saddle Mountains Aquifer Mabton Wanapum Basalt Vantage Grande Ronde Basalt Grande Ronde Aquifer Generalized Stratigraphy in the Glade/Fourmile Subbasin Figure 2 V:\030009 WRIA 31\Final Glade Report\Glade Figures and Tables Figure 2