Late Oligocene-early Miocene Grand Canyon: A Canadian connection?

摘要

Remnants of fluvial sediments and their paleovalleys may map out a late Oligocene-early Miocene "super-river" from headwaters in the southern Colorado Plateau, through a proto-Grand Canyon to the Labrador Sea, where delta deposits contain microfossils that may have been derived from the southwestern United States. The delta may explain the fate of sediment that was denuded from the southern Colorado Plateau during late Oligocene-early Miocene time.