Figure 1.  Map showing the distribution of Wrangellia flood basalts in Alaska, Yukon, and British Columbia. The map is derived from (Wilson et al., 1998; Israel, 2004; Massey et al., 2005a, b; Wilson et al., 2005; Brew, 2007, written comm.). Outlines for the Peninsular and Alexander Terranes are shown in orange and blue, respectively. We refer to the Wrangellia Terrane in Alaska and Yukon as Northern Wrangellia and areas in British Columbia as Southern Wrangellia. Major faults in Alaska and parts of Yukon and BC are shown with purple lines. The Wrangellia, Alexander, Peninsular terranes, which are part of the Wrangellia Composite Terrane, share similar elements or have a linked geologic history [as defined by Plafker et al. (1989), Nokleberg et al. (1994), Plafker & Berg (1994), and Plafker et al. (1994)]. Geochronology from a single pluton in Alaska is proposed to link the Proterozoic to Triassic Alexander Terrane to Wrangellia by late Pennsylvanian time (Gardner et al., 1988).  The Wrangellia and Peninsular Terranes may have been in close proximity by the Late Triassic or Early Jurassic (Rioux et al., 2007).