Old Setouchi

Japanese: 古瀬戸内 - こせとうち
Old Setouchi
After the Miocene epoch of the Tertiary period, a lowland was formed running east to west across the central part of southwestern Japan, and the sea invaded this lowland. This lowland is called the Old Seto Inland Sea, or the Seto Inland Sea area. The sea has existed twice: at the beginning of the middle Miocene (15 to 16 million years ago), and from the middle Pliocene (3 million years ago) until the present. The former period is called the First Seto Inland Sea Period, and the latter the Second Seto Inland Sea Period. The sea of ​​the First Seto Inland Sea Period extended from southern Nagano Prefecture, through the Nobi Plain and Nara Basin, to northern Okayama and Hiroshima Prefectures, connecting with the Pacific Ocean near Ise Bay and the Kii Channel, and with the Sea of ​​Japan near its western end.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
第三紀中新世以後,西南日本の中央部を東西に縦断して低地が形成され,ここに海が浸入した。この低地を古瀬戸内,あるいは瀬戸内区という。海が存在したのは,中新世中期初頭(1500万~1600万年前)と,鮮新世中ごろ(300万年前)以後現在までの2回である。前の時期を第一瀬戸内期,後を第二瀬戸内期という。現在の瀬戸内海は第二瀬戸内期の海の続きである。第一瀬戸内期の海は,長野県南部から濃尾平野,奈良盆地などを経て岡山・広島県北部に続き,伊勢湾付近および紀伊水道付近で太平洋と,また西端付近で日本海に接続していた。

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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