Scientific Investigations Report 2007–5261
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5261
Table 1. Description of hydrogeologic units of the Basin and Range carbonate-rock aquifer system study area, Nevada and Utah.
| Hydrogeologic unit abbreviation for this study |
Equivalent hydrogeologic unit abbreviation in the Death Valley ground- water flow system (Belcher, 2004) |
Hydrogeologic unit name |
Description of hydrogeologic unit |
|---|---|---|---|
| FYSU | ACU | Fine-grained younger sedimentary rock unit | Young Cenozoic lacustrine, playa and basin axis deposits |
| CYSU | AA | Coarse-grained younger sedimentary rock unit | Young Cenozoic alluvial and fluvial deposits |
| VFU | CHVU and BRU | Volcanic flow unit | Cenozoic basalt, andesite, dacite and rhyolite lava flows |
| VTU | TMVA, PVA, and CFPPA | Volcanic tuff unit | Cenozoic ash-flow tuffs |
| OSU | VSU | Older sedimentary rock unit | Consolidated Cenozoic sandstone and limestone |
| MSU | SCU | Mesozoic sedimentary rock unit | Mesozoic limestone, sandstone, and shale |
| UCU | UCA | Upper carbonate-rock unit | Mississippian to Permian carbonate rocks |
| USCU | UCCU | Upper siliciclastic-rock unit | Mississippian siliciclastic rocks and some limestone |
| LCU | LCA | Lower carbonate-rock unit | Cambrian to Devonian predominantly carbonate rocks |
| LSCU | LCCU | Lower siliciclastic-rock unit | Cambrian and Precambrian siliciclastic rocks |
| IU | ICU | Intrusive-rock Unit | Intrusive rocks such as granite and granodiorite, not divided by age |
U.S. Department of the Interior | U.S. Geological Survey
URL: https://pubs.usgs.gov/sir/2007/5261
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