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Younger Cenozoic Foraminiferal Assemblages from the Choshi District, Chiba Prefecture
http://hdl.handle.net/10097/28794
http://hdl.handle.net/10097/28794efb99539-8ec9-4914-881e-350f65c8d563
名前 / ファイル | ライセンス | アクション |
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KJ00004211705.pdf (8.7 MB)
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Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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公開日 | 2008-05-02 | |||||
タイトル | ||||||
タイトル | Younger Cenozoic Foraminiferal Assemblages from the Choshi District, Chiba Prefecture | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
著者 |
Matoba, Yasumochi
× Matoba, Yasumochi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The vertical distribution of the planktonic and benthonic Foraminifera from the younger Cenozoic deposits distributed in the Choshi district and superposed upon the Permian and Cretaceous Systems was studied. The lowest of the Cenozoic units or the Metogahana Formation was previously considered to be Miocene in age from stratigraphic position. The Na-arai Formation rests upon it with clino-unconformity, and is succeeded upwards with conformity by the Iioka and Toyosato Formations. They are covered by the "Katori" Formation with slight clino-unconformity and the latter is overlain with three units of volcanic ash deposits, each of which is unconformable with one another. The Iioka, Toyosato and "Katori" Formations yield abundant Foraminifera and by the benthonic forms are divided into seven units of Bulimina striata-Stilostomella, Bulimina aculeata-Uvigerina akitaensis, Cassidulina carinata, C. subglobosa, Bolivina pacifica, Nonionella-Elphidium, and Pseudononion-Rosalina zones in ascending order. Distinct changes in the coiling direction are seen in Globigerina pachyderma, Globorotalia menardii s. l. and Pulleniatina obliquiloculata in the Choshi section. There is a distinct short interval of sinistrally coiled P. obliquiloculata at the base of the Iioka Formation. This may correspond to the same coiling pattern of the species in the basal part of the Lower Pliocene in the Philippines (Bandy, 1963). Based upon the planktonic foraminiferal fauna, the basal part of the Na-arai Formation can be correlated to Saito's Upper Miocene Globorotalia menardii menardii/Globigerina nepenthes Zone. Although the other part of the Na-arai Formation yielded no Miocene index species of planktonic Foraminifera, the formation is inferred to be below Bandy's Miocene-Pliocene boundary. The basal part of the Iioka Formation is correlated to the basal part of the Kurotaki Formation along the Obitsu River; the upper part of the Bulimina aculeata-Uvigerina akitaensis zone in the Iioka Formation is correlated to the upper part of the Umegase Formation, and is the basal Pleistocene of Asano et at. (1958); the middle part of the Bolivina pacifica zone corresponds to the uppermost part of the Kakinokidai to Chonan Formation. The relations of the benthonic foraminiferal zones between the Choshi district and the Yoro River area in the Boso Peninsula, the sedimentary environment and the tectonic movement in the region are discussed. Two species of benthonic Foraminifera are described as new to science. | |||||
書誌情報 |
The science reports of the Tohoku University. Second series, Geology = 東北大学理科報告. 地質学 巻 38, 号 2, p. 221-A35, 発行日 1967-03-27 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0082464X | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00836349 | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
出版者 | ||||||
出版者 | Tohoku University | |||||
資源タイプ | ||||||
内容記述タイプ | Other | |||||
内容記述 | 紀要類(bulletin) | |||||
登録日 | ||||||
日付 | 2008-05-02 | |||||
日付タイプ | Created | |||||
公開日(投稿完了日) | ||||||
日付 | 2008-05-02 | |||||
日付タイプ | Created | |||||
発行日 | ||||||
日付 | 1967-03-27 | |||||
日付タイプ | Created | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | 8733725 bytes | |||||
公開範囲 | ||||||
値 | 学外 | |||||
更新日 | ||||||
日付 | 2010-01-27 | |||||
日付タイプ | Created |