Four late Quaternary cryostratigraphic units are recognized in the unconsolidated valley-bottom deposits of the Klondike area, Yukon Territory. They are overlain by a Holocene organic unit. The units are distinguished by their cryostratigraphic characteristics and oxygen-isotope ratios of included ground ice. The overlying Quartz Creek Member, a Late Wisconsinan unit, is dominated by organic-rich loess.
Massive ice is noticeably absent, although the sediments are ice rich.
Large ice wedges originate in this unit, and, in places, penetrate the underlying full-glacial sediments. The majority of the massive icy bodies in the King Solomon Formation are ice wedges, but pool ice and aggradational ice are also exposed, especially in the Dago Hill Member. Massive icy beds formed by groundwater intrusion into permafrost occur at the lower contact of the Quartz Creek Member.