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This one-day field trip gives an overview of the geologic framework of this region, with emphasis on its Quaternary geomorphologic and hydrogeologic aspects. Its route (Fig. 1) is northwest from Las Vegas, along an arm of Las Vegas Valley, the problematic trace of the Las Vegas shear zone, to where the shear zone disappears into the Tertiary volcanic field of southern Nevada. Enroute, we pass several late Pleistocene/early Holocene groundwater discharge areas that have been long inactive, and visit a typical one. Then we go west to one of many warm springs in Ash Meadows, a major regional...

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