北海道苫前地域に分布する蝦夷層群Cenomanian/Turonian境界堆積岩の有機地球化学分析による堆積環境・海洋生産変動の復元 Depositional environment and variation in primary production during the Cenomanian-Turonian boundary reconstructed by organic geochemical analysis of sedimentary rocks from the Yezo Group, Tomamae area, Hokkaido, Japan
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