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A tephra layer that conformably underlies the hitherto defined Shimosueyoshi Loam unit is recognized in the moutainous drainage area along the Sagami River and its adjacent east which occupies the western part of the South Kanto plain in central Japan. The lithology of the upper part of the tephra resembles to that of Shimosueyoshi Loam; accordingly the lower limit of the Shimosueyoshi Loam unit is desirable to place at a lower horizon than has been placed. The lower part of the tephra does not, however, resemble to Shimosueyoshi Loam, and moreover pumice layers within this part cannot be correlated to those within Tama Loam. Accordingly a new name “Suarashi Loam” is proposed for this part of the tephra. The Suarashi Loam unit must be younger than the Tama Loam unit because the tephra in question is stratigraphically continuous with the so-called “Shimosueyoshi Loam” unit.In the mountainous area along the Sagami River, four fill terraces were formed during the period from the time just before the deposition of Suarashi Loam down to Musashino Loam age. Since the Tachikawa Loam age, down-cutting of the valley has essentially dominated.

Tephra and the Quaternary History of the Mountainous Area along the Sagami River in Central Japan I