Other known features include what are said to be traces of rainfall, and lotus-leaf-shaped cracks in the dried-up sedimentary surface (sun cracks). On the other hand, features seen on the underside include the remains of filled grooves eroded by running water (flute casts) and the traces of running water erosion caused by the presence of pebbles and living organisms (tool marks). These flow marks and other traces indicate a temporary cessation of sedimentation. *Some of the terminology that mentions "tool mark" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…その他,雨が降った跡といわれるもの,干上がった堆積面が蓮の葉状に割れる干割れ(サンクラックsun crack)などが知られている。一方,下面にみられるものとして,流水が浸食した溝の埋め跡(フルートキャストflute cast)や,小石や生物の存在によりできる流水の浸食跡(トゥールマークtool mark)などがあげられる。これらの流痕やその他の跡は,堆積作用が一時中断していることを示している。… ※「tool mark」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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