@article{oai:air.repo.nii.ac.jp:00001737, author = {佐藤, 時幸 and 神崎, 裕 and 奥山, 貴男 and 千代延, 俊 and Sato, Tokiyuki and Kanzaki, Yutaka and Okuyama, Takao and Chiyonobu, Shun}, journal = {秋田大学大学院工学資源学研究科研究報告, Scientific and technical reports of Graduate school of Engineering and Resource Science, Akita University}, month = {Oct}, note = {We describe in detail the calcareous nannofossil biostratigraphy of the Miocene formations distributed in Hokuriku to northern Japan. Helicosphgaera ampliaperta which indicates NN4 zone in early Miocene, is found in the Turikake, Tanosawa, Sunakobuchi, Kurosedani, Higashi-Innai and Kokozura Formations. The boundary between NN4/NN5 Zone is also traceable to the lower part of the Higashibessho and in the Sunakobuchi Formations. Although the Formations correlated to NN4 Zone are widely found in the Japan Sea side area, Sphenolithus belemnos, early Miocene marker species of NN3, is not found in these area. This indicates that the oldest marine sediments found in the Japan Sea side area are correlated to the interval between 14.91Ma and 17.71Ma.}, pages = {37--45}, title = {北陸~北日本に分布する中新統石灰質ナンノ化石層序}, volume = {31}, year = {2010} }