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Tremadocian
The Tremadocian is the lowest stage of Ordovician. Together with the later Floian stage it forms the Lower Ordovician epoch. The Tremadocian lasted from to million years ago. The base of the Tremadocian is defined as the first appearance of the conodont species ''Iapetognathus fluctivagus'' at the GSSP section in Newfoundland.〔(【引用サイトリンク】url=https://engineering.purdue.edu/Stratigraphy/gssp/index.php?parentid=77 )〕 ==Naming== The Tremadocian is named after the village Tremadoc in Wales. The name was proposed by Adam Sedgwick in 1846 (as "Tremadoc group").
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「Tremadocian」の詳細全文を読む
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