Formations
| Ichijiku Formation: lower Chibanian, 0.78-0.60 Ma Nakayama, N. and Masuda, F. (1987) Ocean current-controlled sedimentary facies of the Pleistocene Ichijiku Formation, Kazusa Group, Boso Peninsula. Jour. Geol. Soc. Japan, 93(11), p.833－845. Nakajima, T. and Watanabe, M. (2005) Geology of the Futtsu District. Quadrangle Series, 1：50,000. Geological Survey of Japan, AIST, 102 pp. |
| The lower part of the Omma Formation: 2.1 - 1.75 Ma 2.1 Ma: Tephrochronology (O1 = Bando2 Tephra) 1.75 Ma: Tephrochronology (O2 = Eb-Fukuda Tephra) Tamura, I. and Yamazaki, H. (2004) Tephrochronological study of the Hokuriku Group -The age of the Hokuriku Group by tephra stratigraphy and correlation to the wide-spread tephra layers-. Jour. Geol. Soc. Japan, 110(7), p.417-436. Kitamura, A. and Kondo, Y. (1990) Cyclic changes of sediments and molluscan fossil associations caused by glacio-eustatic sea-level changes during the early Pleistocene:a case study of the middle part of the Omma Formation at the type locality. Jour. Geol. Soc. Japan, 96(1), p.19-36. |
| The PD2 parasequence set of the Dainichi Formation: Gelasian, 2.2 - 2.1 Ma Shiba, M., Yokoyama, K., Akao, R., Kase, T., Sanada, R., Shibata, S., Nakamoto, T. and Miyamoto, A. (2007) Sequence stratigraphy and biostratigraphic horizon in the Upper Kakegawa Group. Jubilee Publication in Commemoration of Prof. Kamei Tadao's 80th Birthday, p.219-230. |
| The upper part of the Zukawa Formation: Upper Piacenzian, 2.75 - 2.55 Ma 2.75 Ma: Datum A, the floral change from Reticulofenestra spp. (small) assemblage to Coccolithus pelagicus assemblage 2.55 Ma: The top of calcareous nannofossil Zone NN16 Amano, K., Hamuro, M., Hamuro, T., Sato, T. and Ogihara, R. (2012) Influence of the latest Pliocene cooling to the benthic fauna from the central part of the Japan Sea borderland: Molluscan fauna from the Zukawa Formation in Toyama Prefecture. Jour. Geol. Soc. Japan, 118(12), p.810 - 822. |
| The middle part of the Dainenji Formation: Lower Piacenzian, 3.35 - 3.1 Ma 3.35 Ma: The first occurrence of Globorotalia tosaensis 3.1 Ma: The rapid increase of Neodenticula koizumii Yanagisawa, Y., Takahashi, T., Nagahashi, Y., Yoshida, T. and Kurokawa, K. (2003) Tephra beds of the Pliocene Dainenji Formation distributed in the Pacific side of Fukushima Prefecture, northeastern Japan (part 1): Chronostratigraphy. Bull. Geol. Surv. Japan, vol.54(11/12), p.351-364. |
| The middle part of the Yonabaru Formation, Shimajiri Group: Planktonic foraminiferal Zone PL2. Zanclean, 4.36 - 3.84 Ma Ujiie, H. and Kaneko, N. (2006) Geology of the Naha and Okinawashi-Nambu Districts. Quadrangle Series, 1:50,000. Geological Survey of Japan, AIST, 48 pp. |
| The basal conglomerates of "Naarai" Formation: Uppermost Messinian to lower Zanclean, Planktonic foraminiferal Zone PL1, 5.51-4.36 Ma Matoba, Y. (1967) Younger Cenozoic foraminiferal assemblages from the Choshi District, Chiba Prefecture. Sci. Rep. Tohoku Univ., 2nd ser. (Geol.), 3(82), p.221-263. |
| Senhata Conglomerate Member, Amatsu Formation: Lower Messinian, 7.10 - 6.71 Ma 7.10 Ma: The last occurence of small Reticulofenestra interval 6.71 Ma: The rapid increase of Stichocorys peregrina Sawada, T., Shindo, R., Motoyama, I. and Kameo, K. (2009) Geology and radiolarian biostratigraphy of the Miocene and Pliocene Series exposed along the Koitogawa River, Boso Peninsula, Japan. Jour. Geol. Soc. Japan, 115(5), p.206 - 222. Kameo, K., Mita, I. and Fujioka, M. (2002) Calcareous nannofossil biostratigraphy of the Amatsu Formation (Middle Miocene to Lower Pliocene), Awa Group, distributed in the central part of the Boso Peninsula, central Japan. Jour. Geol. Soc. Japan, 108(12), p. 813－828. |
| Aoso Formation: Diatom Subzone 5D, Tortonian, 10.0- 9.3 Ma Suzuki,T., Hayashi, H., Yanagisawa, Y., Fujiwara, O. and Danhara, T. (2019) Integrated chronostratigraphy of the Miocene sedimentary sequence in the northeastern area of Sendai City, Miyagi Prefecture, Northeast Honshu, Japan. Bull. Geol. Surv. Japan, vol.70(1/2), 17-41. |
| Hirakata Channel T8, Taga G: Diatom subzone 5a, Serravallian, 13.1 -12.7 Ma Yanagisawa, Y. and Ando, H. (2020) Neogene Taga and Hitachi groups in the Kitaibaraki-Takahagi area, Ibaraki Prefecture, Japan: sedimentary complexes of shelf to slope deposits, submarine channel fills and submarine slide scar fills, reconstructed from lithostratigraphy and diatom biostratigraphy. Bulletin of the Geological Survey of Japan, vol. 71 (3), p. 85?199. |
| The lower part of the Sekinohana Formation: Calcareous nannofossil Zone CN4, Langhian, 14.9 - 13.5 Ma Kami, S., Kato, M., Kuchida, K. and Takayama, T. (1981) Geological Ages of Calcareous Sandstones on the Noto Peninsula. Annals of Science, College of Liberal Arts, Kanazawa University, 18, p.47 - 63. |
| Godo Formaion, Tokigawa Group: Lower Langhian, 15.2 - 14.9 Ma, 15.6 - 15.2 Ma (Sandy silt gravels) 15.2 Ma: The last occurrence of Cavitatus lanceolatus 14.9 Ma: The base of diatom Subzone NPD 4Ba 15.6 Ma: The first occurrence of C. lanceolatus (The sandy silt gravels in the Godo Formation includes C. lanceolatus) Kurihara, Y., Horiuchi, S.and Yanagisawa, Y. (2003) Lithostratigraphy and integrated diatom and calcareous nannofossil biostratigraphy of the Miocene sequence in the Iwadono Hills area, Saitama Prefecture, central Japan. Jour. Geol. Soc. Japan, 109(4), p.215 - 233. |
| Haratajino Formation: Uppermost Burdigalian to Lower Langhian, 16.1 - 15.1 Ma 16.1 Ma: The first occurrence of Praeorbulina glomerosa 15.1 Ma: The first occurrence of Orbulina suturalis Takahashi, M. and Hayashi, H. (2004) Geology and integrated chronostratigraphy of the Miocene marine sequence in the Tomioka area, Gunma Prefecture, central Japan. Jour. Geol. Soc. Japan, 110 (3), 175-194. |
| The lower part of the Mitsugano Shale-Sandstone Member, Oi Formation: 18.0 - 17.5 Ma The Kitanagano Sandstone Member, Oi Formation: 18.0 - 17.5 Ma (17.5 Ma: Hoshi, Iwano et al., 2019) (18.0 Ma: Age estimated from sedimentation rate) Kinoshita, H. and Yamaji, A. (2021) Arc-parallel extension in preparation of the rotation of southwest Japan: Tectonostratigraphy and structures of the Lower Miocene Ichishi Group. Island Arc 30 (1), e12427 |
HOME
J-elasmo