Alluvial history of the Porcupine River, Alaska; role of glacial-lake overflow from Northwest Canada

Twelve river stages. Terraces that exhibit characteristics suggestive of extremely high discharge, formed when the Porcupine River at the Ramparts acted as an overflow outlet for glacial lakes in northern Yukon Territory. Terraces capped by sediment suggestive of relatively low discharge meandering streams, probably formed when glacial-lake overflow did not occur. Ten radiocarbon dates range from greater than 35,000 to 2,350 + or - 55 yr B.P. Repeated glaciolacustrine inundations of the Old Crow and Bluefish basins during Wisconsinan.--Modified journal abstract.