研究人员通过观测被称为泥炭丘的小丘来测量永冻带边界北退的程度，泥炭丘是在北部泥炭沼泽含冰的土壤上自然形成的。
The researchers measured the retreat of the permafrost border byobserving hummocks known as "palsas, " which form naturally over icecontained in the soil of northern peat bogs.
位于河口湾—浅海相中的最大海侵面将冰后期海侵沉积旋回分为其下的海侵层序和其上的海退层序。
The maximum flooding surface lying in estuarine - shallow Marine muddy unit demarcates the underlying transgressive sequence and overlying regressive sequence.
位于河口湾—浅海相中的最大海侵面将冰后期海侵沉积旋回分为其下的海侵层序和其上的海退层序。
The maximum flooding surface lying in estuarine - shallow Marine muddy unit demarcates the underlying transgressive sequence and overlying regressive sequence.
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