Table 2. Nomenclature for hydrogeologic units of Nevada
Test Site and vicinity
| Regional hydrogeologic unit |
Subregional hydrogeologic unit |
Equivalent previous units (Winograd and Thordarson, 1975) |
|---|---|---|
| Valley-fill aquifer | Valley-fill aquifer1 | Valley-fill aquifer |
| Volcanic-rock aquifer | Welded-tuff aquifer1 | Welded-tuff aquifer Bedded-tuff aquifer |
| Lava-flow aquifer1 | Lava-flow aquifer | |
| Volcanic confining unit | Tuff confining unit1 | Tuff aquitard Lava-flow aquitard |
| N/R2 | Granite1 | Minor aquitard |
| N/R2 | Upper carbonate-rock aquifer1 | Upper carbonate-rock aquifer |
| Eleana confining unit | Eleana confining unit | Upper clastic aquitard |
| Carbonate-rock aquifer | Lower carbonate-rock aquifer | Lower carbonate-rock aquifer |
| Basement confining unit | Quartzite confining unit | Lower clastic aquitard |
| 1 Due to original lenticular or interlayed form of constituent rock bodies, or due to geometric modifications caused by faulting or folding, or both, these hydrogeologic units generally consist of more than one disconnected or partially connected aquifer or confining unit. |
| 2 N/R, no regional hydrogeologic unit is recognized because corresponding subregional units have limited areal extent and do not substantially effect regional ground-water flow. |
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