Associate Professor

Research field

Geology & stratigraphy

Research Interests

1. Cretaceous tephrochronology
2. Cretaceous-Paleogene international stratigraphic correlations
3. Mid-Cretaceous oceanic anoxic events
4. Cretaceous tectonics and paleoenvironments

Selected papers

1. Quidelleur, X., Paquette,J. L., Fiet, N., Takashima, R., Tiepolo, M., Desmares, D., Nishi, H., Grosheny, D. 2011. New U-Pb (ID-TIMS and LA-ICPMS) and 40Ar/39Ar geochronological constraints of the Cretaceous geologic time scale calibration from Hokkaido (Japan). Chemical Geology, 286 72-83.
2. Takashima, R., Nishi, H., Yamanaka, T., Tomosugi, T., Fernando, A.G., Tanabe, K., Moriya, K., Kawabe, F., Hayashi, K., 2011. Prevailing oxic environments in the Pacific Ocean during the mid-Cretaceous Oceanic Anoxic Event 2. Nature Communications, 2:2341DO:10.1038/ncomms1233.
3. Kojo, Y., Komatsu, T., Iwamoto, T., Takashima, R., Takahashi, O., Nishi, H., 2011. Stratigraphy and detailed age of the Upper Cretaceous Himenoura Group in the eastern part of Amakusa-Kamishima Island, Kumamoto, Japan. Journal of the Geological Society of Japan. Vol. 117, 398-416．(in Japanese with English abstract)
4. Hayashi, K., Nishi, H., Takashima, R., Tomosugi, T., Kawabe, F., 2011. Geology and foraminiferal biostratigraphy of Upper Cretaceous sequences in southern central Hokkaido, Japan. Journal of the Geological Society of Japan. Vol. 117, 14-34. (in Japanese with English abstract)
5. Takashima, R., Nishi, H., Yamanaka, T., Hayashi, K., Waseda, A., Obuse, A., Tomosugi, T., Deguchi, N., Mochizuki, S., 2010. High-resolution terrestrial carbon isotope and planktic foraminiferal records of the Upper Cenomanian to the Lower Campanian in the Northwest Pacific. Earth and Planetary Science Letters, vol. 289. 570-582.
6. Fernando, A. G., Takashima, R., Nishi, H., Giraud, F., Okada, H., 2010. Calcareous nannofossil biostratigraphy of the Thomel Level (OAE 2) in the Lambruisse section, Vocontian Basin, southeast France. Geobios, vol. 43, 45-57.
7. Takashima, R., Nishi, H., Hayashi, K., Okada, H., Kawahata, H., Yamanaka, T., Fernando, A. G., Mampuku, M., 2009. Litho-, bio- and chemostratigraphy across the Cenomanian/Turonian boundary(OAE2) in the Vocontian Basin of southeastern France. Palaeogeography, Palaeoclimatology, Palaeoecology，Vol. 273, p. 61-74.
8. Komatsu, T., Naruse, H., Manabe, M., Tsuihiji, T., Ikegami, N., Takashima, R., 2009. Cretaceous non-marine and shallow marine facies and fossils in western Kumamoto, Kyushu, Japan. Field Excursion Guidebook, 4th International Symposium, IGCP507, Paleoclimates of the Cretaceous in Asia and their global correlation. 59 p.
9. Okano, K., Sawada, K., Takashma, R., Nishi, H., Okada, H., 2008. Further examples of archael-derived hydrocarbons in mid-Cretaceous Oceanic Anoxic Event (OAE) 1b sediments. Organic Geochemistry. Vol. 39, p. 1088-1091.
10. Takashima, R., Dick, M. H., Nishi, H., Mawatari, S. F., Nojo, A., Hirose, M., Gautam, P., Nakamura, K., Tanaka, T., 2008. Geology and sedimentary environments of the Pleistocene Setana Formation in the Kuromatsunai District, Southwestern Hokkaido, Japan. In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 75-82.
11. Gautam, P., Takashima, R., Dick, M.H., Kanamatsu, T., Rijal, M.L., Nishi H. and Mawatari, S.F., 2008. Rockmagnetic characterization of the Setana and Chiraigawa Formations in SW Hokkaido (Soebetsu River, Kuromatsunai). In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 101-107.
12. Ishimura T., Dick, M.H., Takashima, R., Hirose, M., Gautam, P., Nishi, H. and Tsunogai, U., 2008. Experimental study of the use of the stable isotopic composition of calcareous microfossils in shallow marine sediments for reconstructing paleoenvironment, and a comparison with the MART index. In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 109-114.
13. Komatsu, T., Yoshihara, K., Dick M. H., Takashima, R., Ostrovsky, A., and Nishi, H., 2008. Habitats of Bivalves in the Lower-Cretaceous Aptian Tanohata and Aptian to Albian Hiraiga Formations, Iwate Prefecture, Northeastern Japan. In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 163-170.
14. Dick, M. H., Hirose, M., Takashima, R., Ishimura, T., Nishi, H. and Mawatari, S. F., 2008. Application of MART Analysis to Infer Paleoseasonality in a Pleistocene Shallow Marine Benthic Environment. In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 83-91.
15. Dick, M. H., Takashima, R., Komatsu, T., Kaneko, N., Mawatari, S. F., 2008. Overview of Pleistocene Bryozoans in Japan. In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 93-99.
16. Okano, K., Sawada, K., Takashima, R., Nishi, H. and Okada, H., 2008. Depositional Environments Revealed From Biomarkers in Sediments Deposited During the Mid-Cretaceous Oceanic Anoxic Events (OAEs) in the Vocontian Basin (SE France). In H. Okada, S. F. Mawatari, N. Suzuki and P. Gautam (eds.), Origin and Evolution of Natural Diversity, Proc. Int. Symp. “The Origin and Evolution of Natural Diversity”, 1-5 October 2007, Sapporro, pp. 233-238.
17. Yamamura, M., Kawahata, H., Matsumoto, K., Takashima, R., Nishi, H., 2007, Paleoceanography of the northwestern Pacific during the Albian. Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 254, p. 477-491.
18. Takashima, R., Sano, S., Iba, Y., Nishi, H., 2007. The first Pacific record of the Late Aptian warming. Journal of the Geological Society, London, vol. 164, p. 333-339.
19. Ostrovsky, A. N., Takashima, R., Dick, M. H., Grischenko, A. V., Nishi, H. and Mawatari, S. F., 2006, First finding of a Cretaceous cheilostome bryozoan from Hokkaido, Japan. Cretaceous Research, vol. 27, p. 859-862.
20. Takashima, R., Coccioni, R., Nishi, H. and Hayashi, K., 2007. Mid-Cretaceous Oceanic Anoxic Events recorded in SE France and central Italy. Journal of the Geological Society of Japan vol. 113, p. iii-iv.
21. Takashima, R., Nishi, H., Huber, B. and Leckie, M., 2006. Greenhouse world and the Mesozoic ocean. Oceanography, vol. 19,82-92.
22. Fernando, A. G. S., Okada, H., Nishi, H., Takashima, R., 2006. Use of a microdrill for high stratigraphical resolution calcareous nannofossil analysis, and a modified filtration method. Journal of Nannoplankton Research,vol. 28, p. 85-87.
23. Takashima, R., Nishi, H. and Yoshida, T., 2006, Late Jurassic-Early Cretaceous intra-arc sedimentation and volcanism linked to plate motion change in northern Japan. Geological Magazine, vol. 143, p. 753-770.
24. Takashima, R., Gautam, P. and Nishi, H., 2006, Recent Advances in Research on Terrestrial and Marine sequences from the mid-Cretaceous Oceanic Anoxic Events (OAEs). Scientific Drilling, no. 2. p. 50-51.
25. Nishi, H., and Takashima, R., 2005. Paleoenvironment and climate changes caused by the Himalayan Tectonics in the East Asia. Journal of the Japanese Association for Petroleum Technology, vol. 70, 6-14. (in Japanese with English abstract)
26. Takashima, R., 2005. Tectonics and anoxic environments. Kaiyo，vol. 37, 881-885． (in Japanese)
27. Takashima, R., Kawabe, F., Nishi, H., Moriya, K., Wani, R. and Ando, H., 2004, Geology and stratigraphy of forearc basin sediments in Hokkaido, Japan: Cretaceous environmental events on the Northwest Pacific margin. Cretaceous Research, vol. 25, p. 365-390.
28. Kawabe, F., Takashima, R., Wani, R., Moriya, K. and Nishi, H., 2003, Biostratigraphy of the Upper Albian to Lower Cenomanian in Oyubari, Hokkaido, Japan: implications for the Cretaceous biochronology in the North Pacific. Acta Geologica Polonica, vol. 53, p. 81-91.
29. Nishi, H., Takashima, R., Hatsugai, T., Saito, T., Moriya, K., Ennyu, A. and Sakai, T., 2003, Planktonic foraminiferal zonation in the Cretaceous Yezo Group, Central Hokkaido, Japan. Journal of Asian Earth Sciences, vol. 21, p. 867-886.
30. Ando, A., Kakegawa, T., Takashima, R. and Saito, T., 2003, Stratigraphic carbon isotope fluctuations of detrital woody materials during the Aptian Stage in Hokkaido, Japan: Comprehensive δ13C data from four sections of the Ashibetsu area. Journal of Asian Earth Sciences, vol. 21, p. 835-847.
31. Takashima, R., Hiroshi, N. and Yoshida, T., 2002, Geology, petrology and tectonic setting of the Late Jurassic ophiolite in Hokkaido, Japan. Journal of Asian Earth Sciences, vol. 21, p. 197-215.
32. Ando, A., Kakegawa, T. and Takashima, R. and Saito, T., 2002, A new perspective on Aptian carbon isotope stratigraphy: Constraints from δ13C records of terrestrial organic matter. Geology, vol. 30, p. 227-230.
33. Takashima, R., Miyamoto, Y., Nishi, H., Yoshida, T., 2002. Geology and Stratigraphy of the Sorachi and Yezo Groups in the Tokyo University Forests in Hokkaido, Japan. Bulletin of the Tokyo University Forest, no. 108, 57-76. (in Japanese with English abstract)
34. Takashima, R., Yoshida, T., Nishi, H., 2001. Stratigraphy and sedimentary environments of the Sorachi and Yezo Groups in the Yubari-Ashibetsu area, Hokkaido, Japan．Journal of the Geological Society of Japan, vol.107, 359-378． (in Japanese with English abstract)
35. Nishi, H., Takashima, R., Hatsugai, T., Ennyu, A., Saito, T., Sakai, T., 2000. Planktonic foraminiferal zonation in Cretaceous Yezo Group, Hokkaido, Japan. Fossil, no. 68, 17-18. (in Japanese with English abstract)
36. Matsumoto T., Takashima R. & Hasegawa K., 2000, Some turrilitid ammonoids from the mid-Cretaceous of the Shuparo Valley, central Hokkaido. Bulletin of the Mikasa City Museum, Natural Science, No 14. p. 1-17.
37. Takashima, R. and Nishi, H., 1999. Re-evaluation of the intra-Yezo disturbance and the Cretaceous tectonics in Hokkaido, Japan. Journal of the Geological Society of Japan, vol. 105, 711-728． (in Japanese with English abstract)
38. Takashima, R., Nishi, H., Saito, T., Hasegawa, T., 1977. Geology and planktonic foraminiferal biostratigraphy of Cretaceous strata distributed along the Shuparo River, Hokkaido, Japan. Journal of the Gelogical Society of Japan, vol. 103, 543-563． (in Japanese with English abstract)
39. Takashima, R., Suzuki, N., Koike, T., Saito, T., 1997. Reexamination of the unconformity proposed at the boundary between the Lower and Middle Yezo Groups in the Soshubetsu area, Hokkaido, and its geological significance - reevaluation of the intra-Yezo disturbance -. Journal of the Geological Society of Japan, vol. 103, 489-492. (in Japanese with English abstract)