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Dark stain
A dark stain is often associated with fossils of the Burgess Shale, representing decay fluids that were squashed out of the organism during the taphonomic process. ==Occurrence== It is most famously known in (and most commonly associated with) ''Marrella'', and is also known in other organisms: for example, ''Aysheaia'', where it protrudes from the anterior (and in one case posterior) end of the animal; ''Hallucigenia'',〔 ''Naraoia'', and ''Alalcomeneaus''. It is also present in other Lagerstätten, for example in Carboniferous crustacea from Ireland.
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「Dark stain」の詳細全文を読む
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