This study focuses on alluvial terraces in part of the North Saskatchewan River valley, near Edmonton, and in the small tributary valleys of Whitemud and Strawberry creeks. The characteristic terrace morphologies and alluvial sediment sequences are briefly described, but most importantly, the deposits are radiocarbon dated for many sites. Twenty-seven new 14C dates on bone, wood, charcoal, and shell materials, along with previously reported dates, provide the chronological framework for the study. Occurrences of the Mazama ash marker bed in terrace alluvium offer additional geochronological evidence. The small tributary valleys have clearly developed in an out-of-phase manner relative to the main river valley, which acts as their local base level. Despite the comparatively abundant geochronological evidence described here, the explanation of alluvial terrace development, in terms of predominant causal factors, remains tantalizingly elusive.