Late Early Cretaceous Tectonics and Paleogeography (105 Ma).

late Early Cretaceous (105 Ma)

Two large volume magmatic belts formed (Peninsular, Sierra Nevada, Idaho; Coast Plutonic complex built on Baja BC); plutonic complexes may have been fed by volatiles from under-thrusting of North American miogeocline

South-moving Baja BC approached maximum S position at latitude of southern Arizona

Baja BC west of classic Great Valley and Franciscan complexes; Great Valley as interarc basin(?)

Rotated North Slope terrane collided with Yukon-Tanana and related terranes

Sevier orogeny continued and foreland basin expanded eastward