静岡県西部下部白亜系伊平層の層序と堆積環境 Stratigraphy and Sedimentary Environment of the Lower Cretaceous Idaira Formation in the Western Part of Shizuoka Prefecture

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著者

    • 安藤 寿男 ANDO Hisao
    • 茨城大学理学部地球生命環境科学教室 Department of Environmental Sciences, Faculty of Science, Ibaraki University

抄録

Non-marine to marine deposits of the Lower Cretaceous Idaira Formation are exposed in north of the Lake Hamana, the western part of Shizuoka Prefecture. The Idaira Formation unconformably overlies the Chichibu Supergroup and is in fault contact with the supergroup. It is divided into three members, namely the lower, middle and upper members.<BR>The lower consists of the basal massive conglomerate and cross-bedded sandstone, and the upper black shale and intervening lenticular-or flaser-bedded sandstone. The latter part abundantly contains such brackish molluscan fauna as <I>Protocardia ibukii, Costocyrena otsukai </I>and <I>Cassiope neumayri</I>, and the Ryoseki-type flora. The two parts are interpreted to be alluvial fan and estuary/ lagoon deposits respectively.<BR>The middle member is composed of large-scale cross-bedded, conglomeratic sandstone with well-sorted sandstone and laminated shale, sometimes including the Ryoseki-type flora. Its sedimentary environment is thought to be braided river on fan delta.<BR>The upper is represented by outer shelf, laminated to massive black shale intercalated with cross-laminated sandstone layers. It yields Barremian ammonite (<I>Shasticrioceras nipponicum</I>), and offshore thin-shelled bivalves (<I>Parvamussium kimurai</I>) and echinoids.

収録刊行物

  • 地學雜誌

    地學雜誌 105(1), 67-76, 1996-02-25

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10003774459
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    3934805
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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