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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 Kačák Event ： ウィキペディア英語版 Kačák Event The Kačák Event ((:ˈkatʃaːk)) or Kačák-''otomari'' Event is a widely recognised bioevent or series of events that occurred close to the end of the Eifelian Age of the Middle Devonian Epoch. It involved a global eustatic rise in sea-level. It was named for the Kačák Member of the Srbsko Formation in Bohemia, where it is represented by a black shale interval within a sequence of limestone. In marine environments, this appears as an anoxic event, often forming potential hydrocarbon source rocks such as the Marcellus Shale. Within the Old Red Sandstone continent, it is represented by the Achanarras lake, the deepest and most widespread lake that developed within the Orcadian Basin. The event is associated with significant extinctions, particularly amongst the Ammonoidea. ==Age and duration== The event occurred towards the end of the Eifelian, extending into the earliest part of the Givetian, in the mid-Devonian period. The duration of the event has been estimated as 700,000 years from the seven cycles involved in the Achanarras interval (each cycle interpreted to represent 100,000 years),〔 but only 200,000 years using geochemical and magnetic resonance data from the Eifelian-Givetian boundary in Morocco. 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「Kačák Event」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.