房総半島西部,下総層群藪層堆積物中の化石花粉群集とその意義

• 奥田 昌明

  千葉県立中央博物館

• 岡崎 浩子

  千葉県立中央博物館

• 佐藤 弘幸

  静岡聖光学院中・高等学校

書誌事項

タイトル別名

• Middle Pleistocene Pollen Assemblages and their Implications for the Yabu Formation, Boso Peninsula, Central Japan.

抄録

Palynological results from the lower part of the Sakata section (35°20′42″N, 139°53′02″E; 20m a. s. l.), belonging to the Yabu Formation (Marine Isotope Stages 9-8) of the Pleistocene Shimosa Group, show good agreements with sedimentological facies changes. A muddy lagoonal unit provides well-diversified pollen assemblages with abundant conifers and consistently high pollen concentrations. By contrast, a sandy shoreface unit provides possibly exotic assemblages with low pollen concentrations and poor floral diversity. The dominant taxon in the lagoonal unit is Picea (spruce) associated with Abies, Pinus, Tsuga, Betula, Fagus, Cupressaceae, etc. The corresponding abundance of Alnus and herbs (mainly Artemisia) indicates the vicinity of the coast. Therefore, the coniferous assemblages do not consist of exotic pollen transported over long distances, but indicate the spread of boreal conifer forest in the Boso Peninsula during cold stages near the end of Stage 9 or Stage 8. This is equivalent to Picea-dominated subarctic to cool-temperate conifer forest reconstructed for the Stage 4 glacial in the Sagami region, Kanagawa Prefecture.

収録刊行物

• 第四紀研究

  第四紀研究 41 (5), 403-412, 2002

  日本第四紀学会

キーワード

• Boso Peninsula
• Middle Pleistocene
• Paleo-Tokyo Bay
• palynology
• Shimosa Group

詳細情報

• CRID: 1390282681474132224
• NII論文ID: 10009969474
• NII書誌ID: AN0034136X
• DOI: 10.4116/jaqua.41.403
• ISSN: 18818129
• ISSN: 04182642
• ISSN: http://id.crossref.org/issn/04182642
• NDL書誌ID: 6318706
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6318706
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
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