Geoscience Reference
In-Depth Information
Figure 3.24.
Magnetic anomalies in the northeastern Pacific. Numbers are anomaly
numbers (Fig. 3.14), not ages. (From Atwater (1989).)
part of the Farallon plate broke off to form the Vancouver plate. The present
Juan de Fuca plate is the remnant of this plate. The location of the boundary
between the Vancouver and Farallon plates was rather variable but the relative
motion was slow oblique compression and subduction of the Vancouver plate
beneath North America continued to take place. At about 30 Ma, the situation
changed when the ridge between the Farallon and Pacific plates first reached the
