Eocene Tectonics and Paleogeography (50 Ma).

Tertiary Eocene (50 Ma)

Intermontane and Baja BC blocks continue northward translation along with north-migrating Kula-Farallon plate boundary; many terranes approach their present latitude with respect to North America

Olympic terrane accreted

Extensive fore arc sedimentation along most of Cordilleran margin

Rocky Mountain foreland uplift, deformation, and shallow-subduction-related magmatism; interior sedimentation mostly restricted to Rocky Mountain foreland basins