Abstract: The outcrop of 7-m terrace in the mouth of Gyda River (70°53ʹ41ʺ N. 78°30ʹ14ʺ E) is the object of the study. There are two generations of ice wedges and four stages of ice lens occurred in peaty sand. Syngenetic ice wedges are in paragenesis with massive ice. Considerable reworking of organic material is proved. Seven cycles of vegetation changes corresponded to local pollen zones. Their duration is about 0.5-2 ka. Sediments accumulated at alternation of subaerial and subaueous stages in 3-13 ka BP.Ice wdges accumulated at the end of the Late Pleistocene in 11-12 ka BP and in the Holocenein 3-4 ka BP. The total annual thawing index variated from 200 to 800 oC x day