Auxiliary material for this article contains a detailed description of the sample collection and analytical methods, a sample location map, and data tables.

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grl27484-sup-0001-readme.txtplain text document2Kreadme.txt
grl27484-sup-0002-txts01.txtplain text document8KText S1. Detailed description of sample collection and analytical methods used in this study.
grl27484-sup-0003-fs01.epsPS document8911KFigure S1. Location of groundwater samples collected and analyzed as part of this study in relation to the three Columbia River Basalt aquifers.
grl27484-sup-0004-ts01.xlsapplication/excel30KTable S1. Columbia River Basalt Aquifer (CRBA) groundwater sample locations, stable isotope composition, tritium content, and carbon-14 ages.
grl27484-sup-0005-ts02.xlsapplication/excel16KTable S2. Mean oxygen isotope values of groundwaters in the Columbia River Basalt Aquifers and Overburden deposits compared to local precipitation.

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