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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Chondrites (genus) ： ウィキペディア英語版 Chondrites (genus) ''Chondrites'' is a trace fossil ichnogenus, preserved as small branching burrows of the same diameter that superficially resemble the roots of a plant. The origin of these structures is currently unknown. ''Chondrites'' is found in marine sediments from the Cambrian period of the Paleozoic onwards. It is especially common in sediments that were deposited in reduced-oxygen environments. ==Morphology== There are four recognized ''Chondrites'' ichnospecies, however, aberrant forms of unknown taxonomic affinity have been discovered. The fossils are made of infilled dendritic rootlike burrows. The branching angles are 30° to 40°, while a shaft diameter varies between 0.1 mm and 10 mm, remaining constant within a single system.〔 ''Chondrites'' is classified as a fodinichnion. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chondrites (genus)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.