Active and Fossil Periglacial Landforms on Mt. Gassan

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On Mt. Gassan (1, 980m), the writers found earth mounds, turf- and stone-banked terraces, patterned grounds and fossil nivation ridges.<BR>Earth mounds develop on the gentle crest rdiges to the north of Mt. Gassan, which are about 1, 900 meters above the sea level. They are 1.8-1.0 meters in diameters and 0.6-0.4 meters in height.<BR>Turf-banked terraces and stone-banked terraces occupy considerable areas with altitudes approximately 1, 900-1, 600 meters above the sea level. Turf-banked terraces are characterized with vegetational mat on the terrace front and tread. Stone-banked terraces are covered with vegetational mat only on the terrace front.<BR>Patterned grounds develop on the summit of Mt. Gassan and on the nivation hollows which are higher than 1, 600 meters above the sea level.<BR>Fossil nivation rdiges develop on the gentle slope on the east side of Mt. Gassan 1, 650-1, 750 meters above the sea level. According to morphological and vegetational evidence, they are not being significantly accentuated at the present.
東北地理学会の論文