Abstract
Since the publication of Milne's paper in 1881, containing his views, on the probable glaciation of Mt. Gassan, a high volcanic cone in the Tôhoku district, glacial topography of Japanese volcanoes has received but scant attention. In the latter part of September, 1936, the author took the advantage of a mountaineering trip to the volcanoes of. Norikura and Ontake, to observe the glacial topography of these mountains. In the former, at an altitude of about 2730m, a small cirque was found developed on the inner side of the western wall of the, crater. In the latter, the crater showed signs of having suffered from. glaciation, resulting in a cirque-like depression with a clear morainic hill. From the photographs taken by Mr. Y. K. Okada, the volcanic mountains of Poromusir Island, N. Kuriles, the highest being over 2000m, are clearly glaciated, exhibiting several cirque on their slopes, the glacial troughs descending from near the top to as low as sea-level. From all these fact, it is evident that such volcanoes as Norikura. and Ontake erupted prior to glaciation, which occured during the dul period of Pleistocene, as classified by Mr. Y, Otuka.
