...Examples of marks on the upper surface of a layer of rock include ripple marks on the surface of a sand layer, which are traces of running water, and crawling tracks of benthic organisms on the surface of a mud layer (trace fossils). Other examples include traces of rainfall and lotus-leaf-shaped cracks on the dried-up sedimentary surface (sun cracks). On the other hand, examples of marks on the lower surface 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 organisms (tool marks). ... *Some of the terminology explanations that mention "sun crack" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…地層上面に付く例として,砂層の表面にみられる流水の跡の流紋(リップルマーク)とか,泥層の表面にみられる底生生物の這(は)い跡などがあげられる(生痕化石)。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。… ※「sun crack」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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