Fig. 1

The study region showing the locations of the island countries and groups listed in Table 1. Plate boundaries (in red) and hotspots active within the past 43 Ma (orange circles) are also shown. Active convergent plate boundaries are shown by lines with triangles pointing in the downthrust direction; all other plate boundaries are undistinguished, although most are transform except for most of the East Pacific Rise where divergence occurs. Hotspot locations are from King and Adam (2014)