Angiosperm pollen fossils from the Upper Cretaceous in Hokkadio : Diversification of angiosperm pollen during the Late Cretaceous in the Aquilapollenites province

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  • TANAKA Satofumi
    Division of Geology, Graduate School of Science and Engineering, Waseda University
  • HIRANO Hiromichi
    Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University

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  • 北海道上部白亜系から産出した被子植物花粉化石 : Aquilapollenites花粉植物地区における白亜紀後期被子植物花粉の多様化について
  • ホッカイドウ ジョウブ ハクアケイ カラ サンシュツ シタ ヒシショクブツ カフン カセキ Aquilapollenites カフン ショクブツ チク ニ オケル ハクアキ コウキ ヒシショクブツ カフン ノ タヨウカ ニ ツイテ

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Abstract

New palynological records from the Upper Cretaceous Yezo Group in the Obira and Teshionakagawa areas of northern Hokkaido provide evidence for a revision of the first appearance age of four angiosperm pollen types (triporate, tetracolporate, triprojectate and oculate) and one characteristic genus (Cranwellia). The study shows that the triporate type pollen is present from the mid Cenomanian, Cranwellia is present from the Lower Turonian, tetracolporate pollen from the mid Turonian, triprojectate pollen from the upper Coniacian and oculate pollen from the upper Campanian. These first appearance ages, which more or less correlate with similar records from China and Russia, indicate that the first appearances in eastern Asia of triprojectate pollen and of Cranwellia are considerably earlier than the records for similar pollen types in North America. This suggests that the plants which produced these pollen types may have first occurred in eastern Asia, and then gradually migrated to North America.

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