In 2002 a high-resolution aeromagnetic survey was conducted over a 940 km2 area extending from Dixie Meadows northeastward to the Sou Hills, and from the eastern front of the Stillwater Range to the western edge of the Clan Alpine Range (Grauch, 2002). The resulting aeromagnetic map is described and discussed by Smith et al. (2002). Many of the shallow faults revealed by the aeromagnetic data (Figure 3) coincide with faults mapped based on surface expression on aerial photographs (Smith et al., 2001). However, in addition there are many magnetic anomaly identified faults in the valley that exhibit no surface expression; and some of the faults with surface expression are actually sections of longer faults. Because of rapid resurfacing of the floor of Dixie Valley, the set of faults defined by magnetic anomalies at shallow depth (100 m fault set, Smith et al., 2002) must be very young, late Pleistocene or Holocene, and thus must be part of the presently active Basin and Range system of extension faulting. The faults interpreted from the high resolution magnetic survey and mapping are combined and shown on Figure 3.
