Boulder - Kyoreki

Japanese: 巨礫 - きょれき
Boulder - Kyoreki
Boulder : Generally a worn, rounded fragment measuring 256 mm or more [Wentworth: 1922, Pettijohn: 1949].
Shingle : A large piece of pebble [edited by Watanabe: 1935]. However, it is larger than gravel and refers to a small stone or gravel, and it is said to correspond to a pebble in the United States [Random House: 1994]. This word is more widely used in the UK than in the US [Robert, et al .: 1983]. It does not seem to be used much in academic circles.

Source: Asakura Publishing Dictionary of Petrology Information

Japanese:
boulder: 一般に摩滅されて円みを帯びた破片で,大きさは256mm以上のもの[Wentworth : 1922, Pettijohn : 1949].
shingle: 礫の大きなもの[渡辺編 : 1935].しかしgravelよりも大きく小石,砂利をいい,米国ではpebbleに当たると述べられている[ランダムハウス : 1994].この語は米国よりも英国の方が広く用いられている[Robert, et al. : 1983].学問的にはあまり用いられないようである.

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