Las Vegas Valley stratigraphy compared to Greenland ice core climate r

Types of groundwater discharge in the Las Vegas Valley compared to isotopic values from the Greenland ice core record (higher isotopic values to the right represent warmer conditions; lower values represent cooler conditions). Wetland expansion and contraction in the Las Vegas Valley marched in virtual lockstep with short-lived, northern hemispheric climate oscillations, including Dansgaard-Oeschger (D-O) cycles, the Bølling (B) and Allerød (A) warm periods, and the Younger Dryas cold event (YD). (USGS Professional Paper 1839)