Timing of late Cenozoic tidewater glaciation in the far North Pacific

The onset of late Cenozoic glacial events in the far North Pacific Ocean is recorded by ice-rafted debris in the Yakataga Formation in the Gulf of Alaska. The dating of these events is controversial. Ages based on molluscs suggest that initial late Cenozoic tidewater glaciation occurred in the early middle Miocene (15-16 Ma). Previous work on planktic foraminifera indicates that this event is no older than late Miocene, probably latest Miocene …