Kuroshio Old Land

Japanese: 黒潮古陸 - くろしおこりく

A land that is believed to have existed to the south when the Shimanto Belt (district) sedimentary area in the southern half of the Outer Zone of Southwest Japan was formed (proposed by the Kishu Shimanto Belt Research Group in 1970). According to sedimentological analysis, the Cretaceous and Paleogene flysch-type clastic deposits of the Shimanto Belt were mainly supplied by lateral or axial currents from the inner zone to the north, but paleocurrent systems indicating lateral currents from the south have also been recognized in various places, and based on the composition of the gravel in the pebble layer and radiometric dating, it is believed that the Kuroshio Paleocontinent contained older orthoquartzite in addition to Cretaceous acidogenic igneous rocks.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

西南日本外帯南半の四万十（しまんと）帯(区)堆積域の形成時，南方に存在したとされる陸地(紀州四万十帯団体研究グループ，1970提唱)。四万十帯の白亜紀，古第三紀のフリッシュ型砕屑（さいせつ）性堆積物は，堆積学的解析によると，主として北側の内帯から側流ないし軸流により供給されたが，南からの側流を示す古流系も各地で認められ，レキ岩層の礫（れき）の構成や放射年代から，黒潮古陸には白亜紀酸成火成岩類などのほかに，より古期のオーソコーツァイトもあったとされる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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