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Legend (WRD/WMB_AquiferSourceCodes500K)

Quaternary Basin Fill (4)
Aquifer Source Codes 500K (3)
Quaternary Basin Fill Quaternary Basin Fill
Eagle Aquifer Eagle Aquifer
Fox Hills - Hell Creek Fox Hills - Hell Creek
Judith River Aquifer Judith River Aquifer
Kootenai Aquifer Kootenai Aquifer
Livingston Aquifer Livingston Aquifer
Cretaceous Shales Cretaceous Shales
Sedimentary Sedimentary
Madison Aquifer Madison Aquifer
Lower Paleozoic Lower Paleozoic
Igneous Rock Alluvium Igneous Rock Alluvium
Fort Union Aquifer Fort Union Aquifer
Tertiary Sediment Tertiary Sediment
Water Water
Fractured Bedrock Fractured Bedrock
<all other values> <all other values>