Early Cretaceous Tectonics and Paleogeography (125 Ma).

Early Cretaceous (125 Ma)

Guerrero arc collided and subduction zone rebuilt on west face

South-moving Wrangellia linked to North Cascades, Tyaughton-Methow, and adjacent terranes to form Baja BC

Tectonic escape of Intermontane terrane and parts of California northward Great Valley forearc basin and Franciscan subduction complex built on reorganized Cordilleran margin; as Baja BC moved southward, northern Great Valley a transpressive basin (?)

North Slope terrane rotated CCW as Canadian basin opened

Early Sevier thrust belt and foreland basin formed