愛媛県城川地域の上部ジュラ系今井谷層群下相層中の鳥巣式石灰岩岩塊より厚歯二枚貝の発見

DOI 機関リポジトリ HANDLE Web Site Web Site 被引用文献3件 参考文献22件

書誌事項

タイトル別名
  • Discovery of Late Jurassic rudist bivalves from the Torinosu-type limestone blocks in the Oriai Formation of the Imaidani Group in the Shirokawa area, Ehime Prefecture, Southwest Japan
  • エヒメケン シロカワ チイキ ノ ジョウブ ジュラケイ イマイダニソウグンカ ソウソウチュウ ノ トリノスシキ セッカイガン ガンカイ ヨリ コウシ ニマイガイ ノ ハッケン

この論文をさがす

抄録

Two rudist taxa, Epidiceras speciosum (Münster) and Monopleura sp. were discovered from the allochthonous Torinosu-type limestone blocks in the Oriai Formation of the Imaidani Group in the Shirokawa area, Southwest Japan. The occurrence of Epidiceras speciosum, indicating a late Kimmeridgian to early Valanginian age, is consistent to the previous age assignment based on the occurrences of middle Kimmeridgian to early Tithonian ammonites (Hybonoticeras) from the overlying Nakatsugawa Formation and the Tithonian radiolarian assemblage of the Imaidani Group. These limestone blocks were thus originally deposited in a shallow marine shelf in the late Kimmeridgian-early Tithonian, and were transported into a deeper environment of shelf slope in the early Tithonian. Monopleura sp. from the Shirokawa area possibly represents the earliest record of this genus and family. The occurrence of Late Jurassic rudists in Torinosu-type limestone suggests that rudists had already expanded globally and that a tropical-subtropical condition prevailed in the shallow marine shelf of East Asia, where the Torinosu-type limestone was deposited at that time.

収録刊行物

  • 地質学雑誌

    地質学雑誌 113 (9), 500-503, 2007

    一般社団法人 日本地質学会

被引用文献 (3)*注記

もっと見る

参考文献 (22)*注記

もっと見る

関連プロジェクト

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ