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Nautilus clarkanus : ウィキペディア英語版 | Nautilus clarkanus
''"Nautilus" clarkanus'' is an extinct species of nautiloid. It lived during the Lower Carboniferous. Fossil specimens have been uncovered in the Spergen Hill Limestone formation of Indiana. ==References==
* (On the Fauna of the Lower Carboniferous limnestones of Spergen Hill, Ind., with a revision of the descriptions of its Fossils hitherto published, and illustrations of the species from the original type series )
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「Nautilus clarkanus」の詳細全文を読む
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