Figure 14. Map showing middle Miocene (blue arrows) and late Miocene and younger (red arrows) streamflow directions in northeastern Nevada. Miocene streamflow directions are based on data presented in this paper. Pliocene and younger directions are based on data in this paper and in Reheis et al. (2002). Note the streamflow reversals in Pine Valley (PV) and the southern Elko basin (EB). Also shown are the general locations of the Chimney (ChB), Ivanhoe (IB), and Carlin (CB) basins. The semicircular tan areas are the major eruptive centers that formed along the east-northeast–migrating track of the Yellowstone mantle plume (from Perkins and Nash, 2002). The thick dashed green line is the middle Miocene axis of a proposed thermal bulge related to the mantle plume, with wetter conditions to the west and drier conditions to the east (from Pierce et al., 2002).