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Muramotoceras : ウィキペディア英語版 | Muramotoceras
''Muramotoceras'' was an unusual genus of heteromorphic ammonite.〔 It was known only from Japan until researchers reported in 2001 that the genus was present in Alaska's Matanuska Formation as well.〔 Its remains likely date to the middle Turonian (from 89.8 to 93.9 million years ago) in both areas.〔 ==See also==
* List of ammonites
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「Muramotoceras」の詳細全文を読む
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