日本の中生代汽水生二枚貝化石群に関する研究の現状 : 天草地域の白亜系から産出する二枚貝の生息域とジュラ紀〜白亜紀マガキ類の古生態について(<特集>干潟の自然,その過去と現在)

• 小松 俊文

  熊本大学理学部地球科学科

書誌事項

タイトル別名

• Present states of research in the Mesozoic brackish-water bivalve assemblages in Japan : habitats of the Cretaceous bivalves in the Amakusa area, and paleoecology of the Jurassic to Cretaceous true oyster(<Special Issue>Nature of tidal flats, its past and present)
• 日本の中生代汽水生二枚貝化石群に関する研究の現状:天草地域の白亜系から産出する二枚貝の生息域とジュラ紀～白亜紀マガキ類の古生態について
• ニホン ノ チュウセイダイ キスイセイ 2マイガイ カセキグン ニ カンスル ケンキュウ ノ ゲンジョウ アマクサ チイキ ノ ハクアケイ カラ サンシュツ スル 2マイガイ ノ セイソクイキ ト ジュラキ ハクアキ マガキルイ ノ コセイタイ ニ ツイテ

抄録

Several issues in the methods of reconstructing paleoecology of the Mesozoic brackish-water bivalves, the contents of the bivalve assemblages and their paleoenvironments in Japan are discussed. The brackish-water environments can be reconstructed as shallow marine environments associated with fluvial systems on the basis of facies analysis. Paleoecology of bivalve fossils is inferred from their modes of occurrence in each depositional environment. Here, descriptions are given for two examples of paleoecologic analysis of the Mesozoic bivalve faunas : (1) Comparisons between the "mid"-Cretaceous Goshoura Group and the Upper Cretaceous Himenoura Group ; both groups are characterized by brackish-water-influenced tidal flat deposits containing abundant true oyster (Crassostrea). Infaunal bivalves of the "mid"-Cretaceous assemblage are characterized by neomiodontids, although those of the Upper Cretaceous assemblage are represented by venerids. (2) Another example is the taxonomy and paleoecology of the Upper Jurassic to Cretaceous primitive Crassostrea. These oysters are ecologically similar to recent Crassostrea, but compared with recent species, shell sizes of the Upper Jurassic and Lower Cretaceous materials are small. Their shell structures are characterized by poorly developed chambers and chalky deposits, which suggest more archaic conditions.

収録刊行物

• 化石

  化石 76 (0), 76-89, 2004

  日本古生物学会

キーワード

• brackish-water bivalves
• Crassostrea
• Cretaceous
• facies analysis
• salinity controlled assemblage
• tidal flat

詳細情報

• CRID: 1390001204435225984
• NII論文ID: 110002704326
• NII書誌ID: AN00041606
• DOI: 10.14825/kaseki.76.0_76
• ISSN: 24242632
• ISSN: 00229202
• NDL書誌ID: 7105843
• Web Site: http://hdl.handle.net/2298/18735
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7105843
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • IRDB
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可