FIGURE 1 Lithospheric plate motion in three dimensions shows plate generation along the mid-ocean ridges, transform motion associated with ridge offsets, and sinking of the plate at the ocean trenches. Reprinted from Isacks et al.

(1968), with permission from the American Geophysical Union.

FIGURE 2 Comparison of magnetic anomaly profiles from the South Atlantic (A), and North Pacific (B) with the Elianin profile (C) from the South Pacific. Correlations of individual anomalies are indicated with dashed lines. |Shaded boxes are the magnetic reversal time scale. Reprinted from Heirtzler et al. (1968), with permission from the American Geophysical Unions.