著者

Aoyama Masafumi

出版者

Department of Geography, Tokyo Metropolitan University

雑誌

Geographical Reports of Tokyo Metropolitan University (ISSN:03868710)

巻号頁・発行日

no.36, pp.49-58, 2001

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Formative periods of rock glaciers distributed in the Yari-Hotaka Mountain Range, northern Japanese Alps, were estimated from weathering rind thickness. The results suggest that the age of rock glaciers in the Minamisawa-Kita cirque and the most headward of the Tenguppara cirque is between the age of Early Yarisawa Stage II moraines and the Late Yarisawa Stage II moraines, and the age of rock glaciers in the northern part of the Tenguppara cirque and Ohkiretto cirque is same or younger than the age of the Late Yarisawa Stage II moraines. The ages of the Early Yarisawa Stage II and the Late Yarisawa Stage II are estimated to 15 ka and 10 ka. Therefore, rock glaciers in the Minamisawa-Kita cirque and the most headward of the Tenguppara cirque were considered to be formed during the Late Glacial Stage (15 ka-10 ka), and rock glaciers in the northern part of the Tenguppara cirque and Ohkiretto cirque were considered to be formed about 10 ka or the early Holocene.