常磐地域高萩地区の中部中新統多賀層群下手綱層のイタヤガイ類卓越貝化石群集と珪藻化石年代

• 栗原 行人

• 柳沢 幸夫

書誌事項

タイトル別名

• A pectinid-dominant molluscan assemblage and diatom biochronology of the middle Miocene Shimotezuna Formation of the Taga Group in the Takahagi district, Joban area, northeast Honshu, Japan
• ジョウバン チイキ タカハギ チク ノ チュウブ チュウシントウ タガソウグン シモテヅナソウ ノ イタヤガイルイ タクエツ カイ カセキ グンシュウ ト ケイソウ カセキ ネンダイ

抄録

Pectinid-dominant molluscan assemblage is first reported from the upper middle Miocene Shimotezuna Formation of the Taga Group in the Takahagi district, Joban area, southern part of northeast Honshu, Japan. Stratigraphic horizon of this assemblage is correlative with the upper part of the Denticulopsis praedimorpha Zone (NPD 5B) of Yanagisawa and Akiba's (1998) diatom zonation, and is estimated to be between 12.0 Ma and 11.5 Ma in age. This assemblage is interpreted to be an indigenous shallow-water marine pebbly sand bottom community on the basis of lithology, generic composition and mode of fossil occurrence. Specific composition of the pectinids in this assemblage differs from those in the contemporaneous assemblages in the central part of northeast Honshu, by containing more relict elements from the latest early to early middle Miocene Kadonosawa Fauna and less characteristic elements of the middle middle to early late Miocene Older Shiobara-Yama Fauna. Such differences may have resulted from a remarkable latitudinal gradient of shallow marine climate in the Pacific coast of northeast Honshu due to the late middle Miocene climatic cooling.

収録刊行物

• 地質学雑誌

  地質学雑誌 108 (7), 421-432_2, 2002

  一般社団法人 日本地質学会

キーワード

• Shimotezuna Formation

詳細情報

• CRID: 1390001206238821120
• NII論文ID: 110003025111
• NII書誌ID: AN00141768
• DOI: 10.5575/geosoc.108.421
• ISSN: 13499963
• ISSN: 00167630
• NDL書誌ID: 6252234
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6252234
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可