...Such sand and clay are repeatedly layered as annual layers, which are the same as tree rings, and are indicated by light and dark colors up to 3 cm thick. G. De Geer (1858-1943) of Sweden named this "verb" (meaning "repeated"). By tracing the outcrops of such varved clay in the direction of glacial retreat and comparing the stratigraphy of the varved clay at each location, it is possible to determine the time and speed at which the glacier retreated. *Some of the terminology that mentions "De Geer, G." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…したがってそのような砂と粘土とが,厚さ3cm以下の色の明暗で示される年輪と同じ意味の年層として,くり返し重なっている。スウェーデンのド・イェールG.De Geer(1858‐1943)はこれを〈バーブ〉(反復するという意味)と名づけた。 氷河の後退した方向に,このような氷縞粘土の露頭を追ってそれぞれのところでの氷縞の層序を対比していけば,氷河が後退した時期やその速度を知ることができる。… ※「De Geer,G.」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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