** peer-review journal article
* internal review bulletin article
no mark non-refereed bulletin article
2021 (in press)
**Izumi, K., Haneda, Y., Suganuma, Y., Okada, M., Kubota, Y., Nishida, N., Kawamata, M., Matsuzaki, T., 2021. Multiproxy sedimentological and geochemical analyses across the Lower-Middle Pleistocene boundary: chemostratigraphy and paleoenvironment of the Chiba composite section, central Japan. Progress in Earth and Planetary Science, vol. 8, article no. 10. (Link)
**Kubota, Y., Haneda, Y., Kameo, K., Itaki, T., Hayashi, H., Shikoku, K., Izumi, K., Head, M.J., Suganuma, Y., Okada, M., in press. Paleoceanography of the northwestern Pacific across the early-middle Pleistocene boundary (marine isotope stages 20-18). Progress in Earth and Planetary Science, vol. XX, pp. XX-XX.
**Suganuma, Y., Okada, M., Head, M.J., Kameo, K., Haneda, Y., Hayashi, H., Irizuki, T., Itaki, T., Izumi, K., Kubota, Y., Nakazato, H., Nishida, N., Okuda, M., Satoguchi, Y., Simon, Q., Takeshita, Y., 2021. Formal ratification of the Global Boundary Stratotype Section and Point (GSSP) for the Chibanian Stage and Middle Pleistocene Subseries of the Quaternary System: the Chiba section, Japan. Episodes. (Link)
2020
**Izumi, K., Suzuki, K., Kemp, D.B., Iizuka, T., 2020. Palaeogeographic and tectonic setting of the Lower Jurassic (Pliensbachian-Toarcian) Nishinakayama Formation, Toyora Group, SW Japan. Geological Journal vol. 55, pp. 862-874. (Link)
**Kemp, D.B., Selby, D., Izumi, K., 2020. Direct coupling between carbon release and weathering during the Toarcian oceanic anoxic event. Geology, vol. 48, pp. 976-980. (Link)
**Toyota, K., Izumi, K., Ichikawa, T., Ohira, T., Takeuchi, K., 2020. Morphometric approaches reveal sexual differences in the carapace shape of the horsehair crab, Erimacrus isenbeckii (Brandt, 1848). Aquatic Animals, AA2020-1.
2019
**Kemp, D.B., Baranyi, V., Izumi, K., Burgess, R.B., 2019. Organic matter variations and links to climate across the early Toarcian oceanic anoxic event (T-OAE) in Toyora area, southwest Japan. Palaeogeography, Palaeoclimatology, Palaeoecology vol. 530, pp. 90-102.
*Izumi, K., Inui, M., 2019. The current state of understanding of rocks and minerals by undergraduate students: Insights from questionnaire survey. Transactions of the Kokushikan University Science and Engineering, Tokyo, Japan 12, 271-274. [in Japanese with English abstract]
Breeden, B.T.III, Izumi, K., 2019. A review of the vertebrate fossil assemblage from the Lower Jurassic Nishinakayama Formation in the Ishimachi district of Toyota Town, Yamaguchi Prefecture, Japan. Bull. Firefly Museum of Toyota Town vol. 11, pp. 9-23.
Izumi, K., Kemp, D.B., Breeden, B.T.III., 2019. The Nishinakayama Formation (Toyora Group) exposed along the Era River revisited: Preliminary report on recent outcrop condition and lithology. Bull. Firefly Museum of Toyota Town vol. 11, pp. 25-35.
Kitabatake, K., Izumi, K., Okoshi, K., 2019. Stratigraphic variation of the trace fossil Phycosiphon from the Lower Jurassic Nishinakayama Formation, Toyora Group, Yamaguchi Prefecture, Japan.
Bull. Firefly Museum of Toyota Town vol. 11, pp. 37-44. [in Japanese with English abstract]
**GSSP proposal group, 2019. A summary of the Chiba Section, Japan: a proposal of Global Boundary Stratotype Section and Point (GSSP) for the base of the Middle Pleistocene Subseries. Journal of the Geological Society of Japan 125, 5-22. (in Japanese with English abstract) (GSSP proposal group (arphabetical): Yuki Haneda, Hiroki Hayashi, Misato Hongo, Kenji Horie, Masayuki Hyodo, Atsuo Igarashi, Osamu Ishizuka, Toshiaki Irizuki, Takuya Itaki, Kentaro Izumi, Koji Kameo, Moto Kawamata, Kenji Kawamura, Jun-Ichi Kimura, Takahiro Kojima, Yoshimi Kubota, Hiroomi Nakazato, Naohisa Nishida, Itaru Ogitsu, Makoto Okada, Masaaki Okuda, Jun’ichi Okuno, Yasufumi Satoguchi, Ryoko Senda, Quentin Simon, Testuo Sueyoshi, Kizuku Shikoku, Yusuke Suganuma, Manami Sugaya, Yoshihiro Takeshita, Mami Takehara, Masami Watanabe, Hisashi Yabusaki, Takeshi Yoshida)
2018
**Izumi, K., Kemp, D.B., Itamiya, S., Inui, M., 2018. Sedimentary evidence for enhanced hydrological cycling in response to rapid carbon release during the early Toarcian oceanic anoxic event. Earth and Planetary Science Letters 481, 162-170. (Link)
**Izumi, K., Endo, K., Kemp, D.B., Inui, M., 2018. Oceanic redox conditions through the late Pliensbachian to early Toarcian on the northwestern Panthalassa margin: Insights from pyrite and geochemical data. Palaeogeography, Palaeoclimatology, Palaeoecology 493, 1-10. (Link)
**Kemp, D.B., Fraser, W.T., Izumi, K., 2018. Stratigraphic completeness and resolution in an ancient mudrock succession. Sedimentology 65, 1875-1890. (Link)
**Suganuma, Y., Haneda, Y., Kameo, K., Kubota, Y., Hayashi, H., Itaki, T., Okuda, M., Head, M.J., Sugaya, M., Nakazato, H., Igarashi, A., Shikoku, K., Hongo, M., Watanabe, M., Satoguchi, Y., Takeshita, Y., Nishida, N., Izumi, K., Kawamura, K., Kawamata, M., Okuno, J., Yoshida, T., Ogitsu, I., Yabusaki, H., Okada, M., 2018. Paleoclimatic and paleoceanographic records through Marine Isotope Stage 19 at the Chiba composite section, central Japan: A key reference for the Early-Middle Pleistocene Subseries boundary. Quaternary Science Reviews vol. 191, pp. 406-430. (Link)
2017
*Izumi, K., Inui, M., 2017a. Significance of Earth System Science education for improving environmental education: Insights from lecture and questionnaire for undergraduate students. Transactions of the Kokushikan University Science and Engineering, Tokyo, Japan 10, 23-28. [in Japanese with English abstract]
*Izumi, K., Inui, M., 2017b. Trace fossils from the Iimuro Formation, Kazusa Group: Systematic descriptions and evaluation for field geology classes. Transactions of the Kokushikan University Science and Engineering, Tokyo, Japan 10, 39-46. [in Japanese with English abstract]
Izumi, K., Sato, T., 2017a. An additional specimen of Carcinoplax longimanus from the Iimuro Formation, Kazusa Group (Komae City, Tokyo). Bull. Kanagawa prefect. Mus. (Nat. Sci.) 46, 1-5. [in Japanese with English abstract] (Link, Open access)
Izumi, K., Sato, T., 2017b. Sexual dimorphism in carapace morphology of Carcinoplax longimanus: A simple discriminating method and its application to fossil specimens. Kanagawa prefect. Mus. (Nat. Sci.) 46, 63-70. [in Japanese with English abstract] (Link, Open access)
*Izumi, K., Suzuki, R., Inui, M., 2017. Estimating the degree of mudstone compactional thinning: Empirical relationship between mudstone compaction and geochemical composition. Transactions of the Kokushikan University Science and Engineering, Tokyo, Japan 10, 29-37. (Link)
2016
**Izumi, K., Yoshizawa, K., 2016. Star-shaped trace fossil and Phymatoderma from the Neogene deep-sea deposits in central Japan: Probable echiuran feeding and fecal traces. Journal of Paleontology 90(6), 1169-1180. (Link)
**Nishida, N., Kazaoka, O., Izumi, K., Suganuma, Y., Okada, M., Yoshida, T., Ogitsu, I., Nakazato, H., Kameyama, S., Kagawa, A., Morisaki, M., Nirei, H., 2016. Sedimentary processes and depositional environments of a continuous marine succession across the Lower-Middle Pleistocene boundary: The Kokumoto Formation, Kazusa Group, central Japan. Quaternary International 397, 3-15. (Link)
2015
**Izumi, K., 2015a. Deposit feeding by the Pliocene deep-sea macrobenthos, synchronized with phytodetritus input: Micropaleontological and geochemical evidence recorded in the trace fossil Phymatoderma. Palaeogeography, Palaeoclimatology, Palaeoecology 431, 15-25. (Link)
**Izumi, K., 2015b. First report of the ichnogenus Phymatoderma from the Hayama Group (Miocene, Japan): Paleobiological and paleoecological implications. Geobios 48, 321-329. (Link)
**Izumi, K., 2015c. Composite Phymatoderma from Neogene deep-marine deposits in Japan: Implications for Phanerozoic benthic interactions between burrows and the trace-makers of Chondrites and Phycosiphon. Acta Palaeontologica Polonica 60(4), 1009-1020. (Link, Open access)
**Izumi, K., Uchman, A., 2015. Comment on "Occurrence of faecal pellet-filled simple and composite burrows in cold seep carbonates: A glimpse of a complex benthic ecosystem" by A. Mazumdar, R.K. Joshi and M. Kocherla [Marine Geology 289 (2011) 117-121]. Marine Geology 364, 65-67. (Link)
**Izumi, K., Netto, R.G., Lima, J.H.D., 2015. Microbe-mediated preservation of invertebrate fecal pellets: Evidence from the ichnofossil Phymatoderma burkei, Permian shallow-marine, Teresina Formation, southern Brazil. Palaios 30, 771-778. (Link)
2014
**Izumi, K., 2014a. Utility of geochemical analysis of trace fossils: Case studies using Phycosiphon incertum from the Lower Jurassic shallow-marine (Higashinagano Formation, southwest Japan) and Pliocene deep-marine deposits (Shiramazu Formation, central Japan). Ichnos 21, 62-72. (Link)
**Izumi, K., 2014b. Isotopic and mineralogical variations in the infill of Chondrites from organic-rich black shale (Posidonia Shale, Germany) for assessing the mode of colonization. Spanish Journal of Palaeontology 29, 107-116. (Link, Open access)
**Izumi, K., Rodríguez-Tovar, F.J., Piñuela, L., García-Ramos, J.C., 2014. Substrate-independent feeding mode of the ichnogenus Phymatoderma from the Lower Jurassic shelf-sea deposits of central and western Europe. Sedimentary Geology 312, 19-30. (Link)
**Kemp, D.B., Izumi, K., 2014. Multiproxy geochemical analysis of a Panthalassic margin record of the early Toarcian oceanic anoxic event (Toyora area, Japan). Palaeogeography, Palaeoclimatology, Palaeoecology 414, 332-341. (Link, Open access)
**Nakajima, Y., Izumi, K., 2014. Coprolites from the upper Osawa Formation (upper Spathian), northeastern Japan: Evidence for predation in a marine ecosystem 5 Myr after the end-Permian mass extinction. Palaeogeography, Palaeoclimatology, Palaeoecology 414, 225-232. (Link)
2013
**Izumi, K., 2013. Geochemical composition of faecal pellets as an indicator of deposit-feeding strategies in the trace fossil Phymatoderma. Lethaia 46, 496-507. (Link)
2012
**Izumi, K., 2012. Formation process of the trace fossil Phymatoderma granulata in the Lower Jurassic black shale (Posidonia Shale, southern Germany) and its paleoecological implications. Palaeogeography, Palaeoclimatology, Palaeoecology 353-355, 116-122. (Link)
**Izumi, K., Miyaji, T., and Tanabe, K., 2012. Early Toarcian (Early Jurassic) oceanic anoxic event recorded in the shelf deposits in the northwestern Panthalassa: Evidence from the Nishinakayama Formation in the Toyora area, west Japan. Palaeogeography, Palaeoclimatology, Palaeoecology 315-316, 100-108. (Link)
2010
*Izumi, K., Tanabe, K., 2010. The early Toarcian OAE in northeastern Tethys from the viewpoint of bioturbation (Toyora area, west Japan). Earth Science Frontiers 17, 357-358.