第四紀研究
Online ISSN : 1881-8129
Print ISSN : 0418-2642
ISSN-L : 0418-2642
本州西端部の海岸段丘
小野 忠熈河野 通弘
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ジャーナル フリー

1964 年 3 巻 5 号 p. 249-263

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Coastal terraces in the western-most part of Honshu can be divided into six series. The first, namely, oldest terrace is about 50m above sea level and is represented by the Oji terrace. Both the second and the third are widely distribused, and they are 20-30m high and 5-15m high, and are represented by the Furudono terrace and the Maruodara terrace, respectively. The fourth terrace is 6-14m below sea level and is called the Ubeoki terrace. These four series of terraces are the Pleistocene Epoch in age. The fifth terrace is about 15m high and is represented by the Kokuga terrace. The sixth, namely, younget terrace is the Chudo terrace, being 7-11m high. These two terraces are the Holocene Epoch in age.
According to the stratigraphical data of the terrace-forming deposits, the first terrace may be correlated the Tama terrace, and the second to the Shimosueyoshi and the third to the Musashino, in the Kanto region, respectively. The fourth may be provably correlated to the Tachikawa terrace, with some questions. The fifth and the sixth may correspond to the Numa and the Yurakucho, respectively.
The stone implements of the Ayaragi culture I indicating to the Paleolithic age, have been collected from the Upper-most horizon of the deposit forming the second terrace at Ayaragi, and the paleolithic implements of the Minogahama culture have been obtained from the uppe-mest horizon of the third terrace deposit at Minogahama.
These are red soils formed during past warmer periods, on the first, second and third terraces, but the precise dating of the formation of these red soils is not fully established.

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