Palinspastic restoration. All points shown on Figs. 1 and 3 are displayed in their approximate locations at 25 Ma. Points not shown in their modern locations are those from the Basin and Range province, Baja California, and California (Fig. DR1). This reconstruction was achieved in seven steps: 1) Translation of Baja California (area in green in Fig. DR1) in a SSE direction so as to close the Gulf of California. 2) Translation of the area in California west of the San Andreas fault (black) SE-ward (parallel to the SAF) by 260 km (Crowell, 1962). 3) Squeezing of the Colorado extensional corridor (brown) in an E-W direction (holding the eastern margin fixed) by 15% (Howard and John, 1987; Davis and Lister, 1988). 4) Squeezing of the southern Basin and Range province of southern Arizona and southern New Mexico in an E-W direction (holding the eastern margin fixed) by 20% (Dickinson, 1991). 5) Squeezing of the Great Basin region (red) in an E-W direction (holding the eastern margin fixed) by 30% (Coney and Harms, 1984). 6) Translation of the modified Mojave desert region to the east such that it contacts the western portion of the modified southern Basin and Range region and the southern portion of the modified Great Basin region. 7) Rotation of points previously in eastern and northern California east of the San Andreas fault (purple and white, respectively) and the previously translated region originally west of the SAF (black) about a pole in southern California such that purple and white regions contacts the modified Great Basin region. Line of projection. Collapsing the data in Fig. 1A onto a line to show the age-distance
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