Author

Isao Motoyama

Observed names: I. Motoyama, ISAO MOTOYAMA, Isao MOTOYAMA, Isao,Motoyama, MOTOYAMA, Isao, Motoyama, Isao

Observed institutions: Kanazawa University, Yamagata University, University of Tsukuba, Tohoku University, University of the Ryukyus, Geological Survey of Japan, The University of Tokyo

ORCID: 0000-0002-6983-261X

Observed ORCID: 0000-0002-6983-261X

OpenAlex ID: A5015482340

Abrupt ventilation changes in the Japan Sea over the last 30 ky: evidence from deep-dwelling radiolarians

2004 · Takuya Itaki, Ken Ikehara, et al. · Palaeogeography Palaeoclimatology Palaeoecology · 129

Orbital- and millennial-scale changes of radiolarian assemblages during the last 220 kyrs in the Japan Sea

2007 · Takuya Itaki, Nozomi Komatsu, et al. · Palaeogeography Palaeoclimatology Palaeoecology · 78

Middle Miocene to Pleistocene radiolarian biostratigraphy in the Northwest Pacific Ocean, ODP Leg 186

2004 · Shin‐ichi Kamikuri, Hiroshi Nishi, et al. · Island Arc · 75

Late Neogene Radiolarian Biostratigraphy in the Subarctic Northwest Pacific

1996 · Isao Motoyama · Micropaleontology · 73

Effects of late Neogene climatic cooling on North Pacific radiolarian assemblages and oceanographic conditions

2007 · Shin-ichi Kamikuri, Hiroshi Nishi, et al. · Palaeogeography Palaeoclimatology Palaeoecology · 71

Formation of pockmarks and submarine canyons associated with dissociation of gas hydrates on the Joetsu Knoll, eastern margin of the Sea of Japan

2013 · Takeshi Nakajima, Yoshitaka Kakuwa, et al. · Journal of Asian Earth Sciences · 56

Radiolarian assemblages in surface sediments along longitude 175°E in the Pacific Ocean

2008 · Shin-ichi Kamikuri, Isao Motoyama, et al. · Marine Micropaleontology · 55

Middle Miocene to Pleistocene magneto‐biostratigraphy of ODP Sites 1150 and 1151, northwest Pacific: Sedimentation rate and updated regional geological timescale

2004 · Isao Motoyama, Nobuaki Niitsuma, et al. · Island Arc · 51

Mid-Cretaceous faunal turnover of intermediate-water benthic foraminifera in the northwestern Pacific Ocean margin

1993 · Kunio Kaiho, Osamu Fujiwara, et al. · Marine Micropaleontology · 48

Neogene diatom and radiolarian biochronology for the middle-to-high latitudes of the Northwest Pacific region: Calibration to the Cande and Kent's geomagnetic polarity time scales (CK92 and CK95).

1998 · Isao Motoyama, Toshiaki Maruyama · The Journal of the Geological Society of Japan · 44

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Radiolarian Biostratigraphy from Middle Miocene to Late Pleistocene in the Japan Sea

2017 · Shin-Ichi Kamikuri, Takuya Itaki, et al. · Paleontological Research · 43

Evolution of Eastern Pacific Warm Pool and upwelling processes since the middle Miocene based on analysis of radiolarian assemblages: Response to Indonesian and Central American Seaways

2009 · Shin-ichi Kamikuri, Isao Motoyama, et al. · Palaeogeography Palaeoclimatology Palaeoecology · 41

Neogene Radiolarian Biostratigraphy and Faunal Evolution Rates in the Eastern Equatorial Pacific ODP Sites 845 and 1241

2009 · Shin-Ichi Kamikuri, Isao Motoyama, et al. · Acta Palaeontologica Polonica · 40

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Origin and evolution of Cycladophora davisiana Ehrenberg (Radiolaria) in DSDP Site 192, Northwest Pacific

1997 · Isao Motoyama · Marine Micropaleontology · 38

Site C0002

2014 · M. Strasser, B. Dugan, et al. · Proceedings of the Integrated Ocean Drilling Program. Expedition reports/Proceedings of the Integrated Ocean Drilling Program · 37

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Distribution of radiolarians in North Pacific surface sediments along the 175°E meridian

2005 · Isao MOTOYAMA, Akira NISHIMURA · Paleontological Research · 37

Lithostratigraphy and calcareous microfossil biochronology of the Cretaceous strata in the Oyubari area, Hokkaido, Japan.

1991 · Isao Motoyama, Osamu Fujiwara, et al. · The Journal of the Geological Society of Japan · 36

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Radiolarian faunal turnover across the Oligocene/Miocene boundary in the equatorial Pacific Ocean

2005 · Shin-ichi Kamikuri, Hiroshi Nishi, et al. · Marine Micropaleontology · 28

Expedition 338 summary

2014 · M. Strasser, B. Dugan, et al. · Proceedings of the Integrated Ocean Drilling Program. Expedition reports/Proceedings of the Integrated Ocean Drilling Program · 26

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Foraminiferal oxygen and carbon isotopes during the last 34 kyr off northern Japan, northwestern Pacific

2006 · Mayumi Hoshiba, Naokazu Ahagon, et al. · Marine Micropaleontology · 23

Radiolarian Assemblages in Surface Sediments of the Japan Sea

2016 · Isao Motoyama, Yasumi Yamada, et al. · Paleontological Research · 21

Biostratigraphic Age Models and Sedimentation Rates along the Southwest African Margin

1998 · J. Giraudeau, B.A. Christensen, et al. · 21

Environmental fluctuations in the northwestern Pacific Ocean during the last interglacial period: Evidence from radiolarian assemblages

2014 · Yukihito Yasudomi, Isao Motoyama, et al. · Marine Micropaleontology · 18

Geology, radiolarians, and geologic age of the Hokusetsu Subgroup in the Shitara area, Aichi Prefecture, central Japan.

2000 · Hiroyuki Hoshi, Nobuyoshi Ito, et al. · The Journal of the Geological Society of Japan · 17

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Methods

2014 · M. Strasser, B. Dugan, et al. · Proceedings of the Integrated Ocean Drilling Program. Expedition reports/Proceedings of the Integrated Ocean Drilling Program · 16

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Works count: 157

Citation count: 1,330

H-index: 21

I10-index: 29