月山の現成および化石周氷河地形
1969 年 21 巻 4 号 p. 211-216
詳細
1969 年 21 巻 4 号 p. 211-216
On Mt. Gassan (1, 980m), the writers found earth mounds, turf- and stone-banked terraces, patterned grounds and fossil nivation ridges.
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.
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.
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.
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.
