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Earth Evolutionary History Lab
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A lab that uses fieldwork to study sedimentary rocks and explore the history of Earth's surface environment.
AboutAbout the lab
Reading Earth's environmental history from sedimentary rocks.
The Earth Evolutionary History Lab studies, based on fieldwork, the processes by which Earth's surface environments have formed.
Lab members go out to mountains and coastlines to examine sedimentary rocks that formed thousands to hundreds of millions of years ago.
The lab aims to determine when, where, and how these sediments were deposited, in order to understand environmental change on the scale of Earth's history.
The lab also addresses the origins of the Japanese archipelago and the Pacific Ocean, investigating the history of Earth's changes using a fossil-based "time axis."
Key terms
- Sedimentary rock
- Rock formed by the consolidation of sediments that accumulated on the seafloor and elsewhere. It remains as strata and serves as a record of past environments.
- Microfossil
- A fossil so small that it must be viewed under a microscope. Examples include radiolarians and conodonts, and they provide clues to the age of strata.
- Isotope ratio
- The proportion of atoms of the same element that differ in mass. By analyzing elements in strata, it is used as a clue to extraterrestrial impacts and volcanic activity.
ResearchResearch themes
The Earth Evolutionary History Lab uses field surveys as its foundation to investigate, from sedimentary rocks, how Earth's surface environment has changed. It also addresses questions such as how the Japanese archipelago and the Pacific Ocean formed, using information from sedimentary rocks and fossils.
*Illustrative imageEarth's Surface History Read from Sedimentary Rocks
The lab examines sedimentary rocks formed thousands to hundreds of millions of years ago, using field surveys and information from the seafloor. By determining when, where, and how they were deposited, it seeks to understand environmental change on the scale of Earth's history.
*Illustrative imageOrigins of the Japanese Archipelago and Other Regions
The lab also addresses questions about how the Japanese archipelago, the Pacific Ocean, and the Rocky Mountains formed. It examines fractures and strain in strata and rocks, and uses a fossil-based "time axis" to explore the history of Earth's changes.
*Illustrative imageEnvironmental Change Leading to Mass Extinctions
The lab investigates how changes in the marine environment that caused mass extinctions are recorded in sedimentary rocks. It combines microfossils such as radiolarians and conodonts with methods from sedimentology and geochemistry.
*Illustrative imageTraces of Extraterrestrial Impacts and Volcanic Activity
In continuous sedimentary sequences across the boundaries between geological periods that record mass extinctions of life, the lab analyzes changes in element concentrations and isotope ratios in detail. It aims to clarify changes in the atmosphere and oceans, and the responses of ecosystems.
MembersFaculty
- ProfessorTetsuji Onoe
- Associate ProfessorShoichi Kiyokawa
- Assistant ProfessorHonami Sato
VoicesStudent voices
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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: “Atapuerca dig site” Bcerrato1 / CC BY-SA 4.0 (cropped)
- Earth's Surface History Read from Sedimentary Rocks: “Structurally tilted sedimentary rocks (Price Formation, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) )” James St. John / CC BY 2.0 (cropped)
- Origins of the Japanese Archipelago and Other Regions: “Japan separation” Oghmoir Satellite picture from NASA, in public domain / CC BY-SA 3.0 (cropped)
- Environmental Change Leading to Mass Extinctions: “Radiolarian Chert near Cayucos - Flickr - Pete Tillman” Peter D. Tillman from USA / CC BY-SA 2.0 (cropped)
- Traces of Extraterrestrial Impacts and Volcanic Activity: “Barringer Crater aerial photo by USGS” USGS/D. Roddy / Public domain (cropped)
- Related lab (Earth System Chemistry Lab): “Pāhoehoe Lava flow” Brocken Inaglory / CC BY-SA 3.0 (cropped)
- Related lab (Earth Interior Dynamics Lab): “The Day the Earth Smiled - PIA17172” NASA/JPL-Caltech/SSI / Public domain (cropped)
- Related lab (Deep Earth Physics Lab): “June 2014 magnetic field” ESA/DTU Space / Public domain (cropped)
- Related lab (Atmospheric Fluid Dynamics Lab): “PSM V53 D324 General circulation of atmosphere” 作者不詳 / Public domain (cropped)
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