…At a depth of about 20 to 30 meters, an unconformity is seen between the upper and lower layers, the lower part being due to a transgression in the Late Glacial Period (about 20,000 to 10,000 years ago), and the upper part being due to a transgression in the Postglacial Period (after about 10,000 years ago), the latter being the Jomon transgression. The Yurakucho transgression is said to correspond to the Flandrian transgression, which has the Flanders Marine Formation in northern France as its type site. There, too, the highest peak was 3 to 4 meters above present sea level during the Postglacial climatic optimum, indicating the global nature of the transgression. … *Some of the terminology that mentions "Flandrian transgression" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その深度20~30m付近には上・下部層を境する不整合がみられ,下部は晩氷期(約2万~1万年前),上部は後氷期(約1万年前以降)の海進によるもので,この後者が縄文海進にあたっている。有楽町海進は,北フランスのフランドル海成層を模式地とするフランドル海進Flandrian transgressionに相当するといわれる。そこでも後氷期の気候最適期には現海面上3~4mの最高頂面をもち,海進の汎世界性を示している。… ※「Flandrian transgression」について言及している用語解説の一部を掲載しています。 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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