till

Japanese: till
till

...Well-sorted deposits are also called well-sorted, and examples of this are desert sands that are exposed to wind for long periods of time and the gravel of beaches with high water flow energy. On the other hand, poorly sorted deposits are typically called tills. These are formed when the termini of glaciers melt and the mud and gravel mix in situ without being affected by drifting ice.

*Some terminology explanations that mention "till" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…分級が進んだ堆積物はまた淘汰が良いとも呼ばれ,長期にわたり風の作用下に置かれる砂漠の砂や流水エネルギーの高い波打ちぎわの砂礫(されき)はその好例である。逆に,分級度の低い,言い換えれば淘汰の悪い堆積物の代表はティルtillと呼ばれるものである。これは氷河の末端が解けて流氷の作用を受けずに泥や礫がその場に混じり合って堆積したものである。…

※「till」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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