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Ikeda Lab
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The lab reads the history of climate and life from the striped patterns in rock strata.

AboutAbout the lab
The history of Earth and life, preserved in rock strata
The Ikeda Lab studies how Earth's environment and life have influenced each other throughout geological time.
In particular, it investigates how changes in insolation drive climate change, and how this relates to the extinction, adaptation, and evolution of dinosaurs, plants, and other organisms.
The lab has also continued research on reading Milankovitch cycles from the striped patterns of bedded chert, a stratum formed in the deep sea.
Through fieldwork, geochemical analysis, and analysis of the fossil record, the lab aims to uncover the causes and actual nature of major environmental changes in Earth's history.
Key terms
- Milankovitch cycles
- Cycles of change in the amount of insolation, caused by periodic variations in Earth's orbit and the tilt of its rotation axis
- Bedded chert
- A deep-sea stratum in which layers of hard rock, derived from the shells of radiolarians and other organisms, and layers of mud are stacked in a striped pattern
- Mass extinction
- An event in which many kinds of organisms went extinct all at once within a short period of geological time
NewsLab news
An undergraduate student received the Outstanding Bachelor's Thesis Award
A master's student received the Graduate School of Science Research Encouragement Award
Published a paper on increased biological productivity during the Jurassic oceanic anoxic event
Published a paper on disturbances of the carbon cycle in the Late Triassic
A book to which the lab contributed chapters, The Age of Dinosaurs: The Mesozoic (Earth and Life History Series, Vol. 4), was published
ResearchResearch themes
The lab studies how the interactions between Earth's environment and ecosystems have changed over the course of Earth's history. Through fieldwork, geochemical analysis, and analysis of the fossil record, it decodes the causes and actual nature of major environmental changes in Earth's history.
*Illustrative imageTurbulent Climate from the Stone Age to the Yayoi Period
The lab is clarifying the actual nature of the drastic climate changes that occurred in the Stone Age, the Jomon period, and the Yayoi period, and exploring their relationship to the "agricultural revolution" that marked the beginning of farming.
*Illustrative imageThe Largest Mass Extinction and Wildfires
In collaboration with Yamaguchi University, the lab is investigating whether fires caused the largest mass extinction in the history of life on Earth (at the end of the Permian). It has also published a paper on wildfires that recurred on a century-long scale.
*Illustrative imageThe End-Triassic Mass Extinction and Volcanism
The lab investigated the actual nature of the end-Triassic mass extinction and, in collaboration with Tohoku University, showed the possibility that global cooling caused by volcanic activity led to the flourishing of dinosaurs.
*Illustrative imageMonsoons and Dinosaur Evolution
The lab is studying the hypothesis that changes in rainfall caused by the "mega-monsoon" of the supercontinent Pangaea triggered the early evolution of dinosaurs.
MembersFaculty
The members of the Ikeda Lab consist of faculty, postdoctoral researchers, and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorMasayuki IkedaPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Ribbon chert of the Marin Headlands Terrane, exposed at Marshall's Beach, San Francisco” Callanbentley / CC BY 4.0 (cropped)
- Turbulent Climate from the Stone Age to the Yayoi Period: “Five Lakes of Mikata 3” Kerakon / CC BY-SA 4.0 (cropped)
- The Largest Mass Extinction and Wildfires: “Permian-Triassic boundary at Frazer Beach, NSW” Dippiljemmy / CC BY-SA 4.0 (cropped)
- The End-Triassic Mass Extinction and Volcanism: “Palisades Sill near Englewood Cliffs” CrankyScorpion / CC BY-SA 3.0 (cropped)
- Monsoons and Dinosaur Evolution: “Plateosaurus skeletal mount 02” Kritzolina / CC BY-SA 4.0 (cropped)
- Related lab (Tajika Lab): “Snowball Huronian” Oleg Kuznetsov - 3depix - http://3depix.com/ / CC BY-SA 4.0 (cropped)
- Related lab (Yamaguchi Lab): “Flexure-chert kyuzo-pass01” KAMUI / CC BY-SA 3.0 (cropped)
- Related lab (OFGS (Ocean Floor Geoscience / Okino-Kuroda Lab)): “Louisville seamount chain - bathymetry” World Data Center for Geophysics & Marine Geology (Boulder, CO), National Geophysical Data Center, NOAA / Public domain (cropped)
- Related lab (Maeno Lab (Volcano Research Center)): “Shinmoe-dake Volcano Erupts on Kyushu Feb 2011” Robert Simmon / Public domain (cropped)
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