Formations
| The lower part of the "Yurakucho" Formation: 10.2 - 7.8 cal ka BP Yurakucho Formation: Tanabe, S., Ishihara, Y. and Nakanishi, T. (2010) Stratigraphy and physical property of the Alluvium under the Tokyo and Nakagawa Lowlands, Kanto Plain, central Japan: implications for the Alluvium subdivision. Jour. Geol. Soc. Japan, 116(2), p. 85-98. Endo, K., Ishiwata, S., Hori, S. and Nakao, Y. (2013) Tokyo Lowland and Chuseki-so: Formation of the Soft Ground and Jomon Transgression. Journal of Geography (Chigaku Zasshi), 122(6), p.968 - 991. Radiocarbon dating: 8770±100 - 8290±100 BP Kato, H., Kato, A. and Isaji, S. (2012) Holocene Fossil Assemblages from the Reclaimed Ground and Beaches in the Tokyo Bay Coast of Chiba Prefecture, Japan. Jour. Nat. Hist. Mus. Inst., Chiba, 12(1): p.17 - 25. Radiocarbon dating: 8780±30 - 7070±30 BP (Using radiocarbon data from GS-CB-2 and GS-CB-3 cores correlative to the lower part of the Yurakucho Formation) Komatsubara, J., Miyachi, Y., Nakazawa, T., Nakashima, R., Kazaoka, O. and Yoshida, T. (2017) Stratigraphic framework and correlation between sediment cores of the upper Quaternary in the Tokyo-Bay area of Chiba Prefecture. GSJ Interim Report, Annual Report of Investigations on Geology and Active Faults in the Coastal Zone of Japan (FY2016), 74, p.31 - 37. Calibrated by OxCal v4.4.4 Bronk Ramsey (2021) Bronk Ramsey, C. (2009) Bayesian analysis of radiocarbon dates. Radiocarbon, 51(1), p.337 - 360. Reimer, P., Austin, W., Bard, E., Bayliss, A., Blackwell, P., Bronk Ramsey, C., Butzin, M., Cheng, H., Edwards, R., Friedrich, M., Grootes, P., Guilderson, T., Hajdas, I., Heaton, T., Hogg, A., Hughen, K., Kromer, B., Manning, S., Muscheler, R., Palmer, J., Pearson, C., van der Plicht, J., Reimer, R., Richards, D., Scott, E., Southon, J., Turney, C., Wacker, L., Adolphi, F., Buntgen, U., Capano, M., Fahrni, S., Fogtmann-Schulz, A., Friedrich, R., Kohler, P., Kudsk, S., Miyake, F., Olsen, J., Reinig, F., Sakamoto, M., Sookdeo, A. and Talamo, S. (2020) The IntCal20 Northern Hemisphere radiocarbon age calibration curve (0-55 cal kBP). Radiocarbon, 62(4), p.725 - 757. |
| Jizodo Formation: 0.43-0.34 Ma Nakajima, T. and Watanabe, M. (2005) Geology of the Futtsu District. Quadrangle Series, 1：50,000. Geological Survey of Japan, AIST, 102 pp. |
| 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 middle part of the Omma Formation: 1.44 - 1.20 Ma 1.44 Ma: FAD Gephyrocapsa (Large) 1.20 Ma: LAD Gephyrocapsa (Large) 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. Takayama, T., Sato, T., Kameo, K. and Goto, T.(1995) Quaternary Coccolith Biostratigraphy and the Age of the Pliocene/Pleistocene Boundary. The Quaternary Research (Daiyonki-Kenkyu). 34(3) p. 157 - 170. Sato, T. and Kameo K. (1996) Pliocene to Quaternary calcareous nannofossil biostratigraphy of the Arctic Ocean, with reference to late Pliocene glaciation. Thiede, J., Myhre, A.M., Firth, J.V., Johnson, G.L., and Ruddiman, W.F. (Eds.), Proceedings of the Ocean Drilling Program, Scientific Results, 151, p.39 - 59. 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) 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. 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. |
| The PD2 parasequence set of the Dainichi Formation: 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 Ananai Formation: 2.8 - 2.5 Ma Kondo, Y. (2012) Interesting Shell Fossils in Kochi; A Guide to Observation at Tonohama, Yasuda. Suzuki, T. and Yoshikura, S. (Eds.), Geology of Kochi in the Latest Edition: A Tectonic Tale. Minaminokazesha, Kochi. p.147 - 160. The lower part of the Ananai Formation: 3.6 - 3.4 Ma Nakayama, K., Kondo, Y. and Yamaoka, Y. (2019) Gastropod subgenus Suchium (Trochidae: Umbonium) from the Pliocene-Pleistocene Ananai Formation, Kochi. Scientific and Educational Reports of the Faculty of Science and Technology, Kochi University, 2 (4), p.1 - 6. |
| 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), p.17 - 41. |
| Hirakata Channel T8, Taga Group: Diatom subzone 5a, Serravallian, 13.1 -12.7 Ma Hirakata Channel T5, Taga Group: Diatom Subzone 4A6 - 4A7, Serravallian, 14.8 -14.5 Ma Takaku Formation, Taga Group: Diatom Subzone 3A2 - 4A7, Burdigalian, 16.7 - 16.6 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), p.175 - 194. |
| Fukuhira Formation, Yatsuo Group: Burdigalian, 17.2 - 16.6 Ma Kurosedani Formation, Yatsuo Group: Burdigalian, 17.2 - 16.6 Ma 17.2 Ma: Chron C5Dn/C5Cr boundary 16.6 Ma The first occurrence of Denticulopsis praelauta Kaneko, K.(2001) Stratigraphy and geotectonic history of Miocene volcanic-volcaniclastic rocks in the eastern part of Toyama Prefecture, central Japan. Jour. Geol. Soc. Japan, 107 (12), p.729 - 748. Nakajima, T., Iwano, H., Danhara, T., Yamashita, T., Yanagisawa, Y., Tanimura, Y., Watanabe, M., Sawaki, T., Nakanishi, S., Mitsuishi, H., Yamashina, O. and Imahori, S. (2019) Revised Cenozoic chronostratigraphy and tectonics in the Yatsuo Area, Toyama Prefecture, central Japan. Jour. Geol. Soc. Japan, 125(7), p.483 - 516. Yanagisawa, Y.(1999) Diatom biostratigraphy of the lower to middle Miocene sequence in the Yatsuo area, Toyama Prefecture, central Japan. Bull. Geol. Surv. Japan, 50, p.139 - 165. |
| The lower part of the Mitsugano Shale-Sandstone Member, Oi Formation: Burdigalian, 18.0 - 17.5 Ma The Kitanagano Sandstone Member, Oi Formation: 18.0 - 17.5 Ma 17.5 Ma: C5Dn/C5Dr boundary 18.0 Ma: Age estimated from sedimentation rate Hoshi, H., Iwano, H., Danhara, T., Oshida, H., Hayashi, H., Kurihara, Y. and Yanagisawa, Y. (2019) Age of the N7/N8 (M4/M5) planktonic foraminifera zone boundary: constraints from the zircon geochronology and magnetostratigraphy of early Miocene sediments in Ichishi, Japan. Chem. Geol., 530, 119333. 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 |
| Jinnobaru Formation, Ashiya Group: Rupelian - Chattian, 29.5 - 26.83 Ma ・Norimatsu Formation (underlying the Jinnobaru Formation) and Honjo Formation (overlying the Jinnobaru Formation): Calcareous nannofossil Zone CNO4, Rupelian - Chattian, 30.0 - 26.93 Ma 30.0 Ma: The first occurrence of Sphenolithus distentus 26.93 Ma: The last occurrence of Sphenolithus predistentus Okada, H. (1992) Calcareous nannofossils and biostratigraphy of the Paleogene sequences of northern Kyushu, Japan. Journal of the Geological Society of Japan, 98: 505 - 528. Agnini, C., Fornaciari, E., Raffi, I., Catanzariti, R., Palike, H., Backman, J. & Rio, D. (2014) Biozonation and biochronology of Paleogene calcareous nannofossils from low and middle latitudes. Newsletters on Stratigraphy, 47, p.131 - 181. doi: 10.1127/0078-0421/2014/0042. Ozaki, M., Hamasaki, S. and Yoshii, M. (1993) Geology of the Orio District. Quadrangle Series, 1：50,000. Geological Survey of Japan, AIST, 121 pp. ・Norimatsu Formation (overlying the Yamaga Formation): Planktonic foraminiferal Zone O4 (P21a), 29.5 - 28.3 Ma Tsuchi, R., Shuto, T. and Ibaraki, M. (1987) Geologic ages of the Ashiya Group, North Kyushu from a viewpoint of planktonic foraminifera. Rep. Fac. Sci., Shizuoka Univ., 21: p.109 - 119． Yamaga Formation, Ashiya Group: Rupelian, 32 - 28.3 Ma ・Norimatsu Formation (overlying the Yamaga Formation): Planktonic foraminiferal Zone O4 (P21a), 29.5 - 28.3 Ma Tsuchi, R., Shuto, T. and Ibaraki, M. (1987) Geologic ages of the Ashiya Group, North Kyushu from a viewpoint of planktonic foraminifera. Rep. Fac. Sci., Shizuoka Univ., 21, p.109 - 119． 32 (31.7±2.3) Ma: Fission track age of the lowest part of the Yamaga Formation Ozaki,M. and Hamasaki, S. (1991) Fission track ages of the Paleogene strata in the northern part of Fukuoka Prefecture, Southwest Japan. Jour. Geol. Soc. Japan, 97(3)，p.251 - 254． |
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