Abstract
Palsas and peat plateaus in different stages of development, occur in the bog on the south of Mt. Hiragatake, the Daisetsu Mountains, Japan (43° 37' N). The internal structure of a palsa was investigated by drilling. The palsa consisted of a peat cover about 1 m thick and permafrost core of sand and silt. The permafrost base was at a depth of 523 cm. The analysis of the drilling cores revealed that a frost-susceptible silt layer, which contains many layers of ice-lenses, lies about 3 m deep below the ground surface. The silt layer was rich in ice and had volumetric and weight ice contents of 70-90% and 100-400%, respectively. Because the palsas in the bog cannot begin to heave until the frost penetrates to the silt layer at a depth of 3 m, they do not readily to grow in their early developmental stage.
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