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January 1, 2026The Quaternary Research (Daiyonki-Kenkyu)

Early Pleistocene Nishikubo Tephra (NK) newly found in the Sayama Formation of the Kazusa Group, west Kanto Plain, NE Japan

Takehiko Suzuki Mioko KAWABATA Paul G. Albert Christina Manning Tomonori Naya Tohru Fukushima Izumi Fukushima

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Key Points

To identify and analyze newly discovered Nishikubo tephra within the Sayama Formation of the Kazusa Group in Japan.
Investigated sediment samples from the Sayama Formation in the Kazusa Group.
Characterized tephra using refractive index and chemical composition analysis.
Studied diatom fossils to infer sedimentation environments.
Identified Nishikubo tephra within the silty layer of the Sayama Formation.
Tephra is stratigraphically positioned below Zoshiki tephra and above SGO tephra.
Estimated deposition age of tephra is between 1.35 and 1.45 million years around MIS 43, 45, 47.

Implication

Geological exploration uncovers new tephra layer in Japan, suggesting significant climatic changes.

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Cite This Study

Suzuki et al. (2026) studied this question.

synapsesocial.com/papers/69e07bc12f7e8953b7cbd75e https://doi.org/10.4116/jaqua.65.2512

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Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

1Identification and correlation of the Aso‐3 tephra in the Omaezaki area, central Japan: A valuable key stratum for the MIS 6/5 transition periodOriginal Research · 2026
2Improving Quaternary tephrostratigraphy and cryptotephrostratigraphy of Hole ODP797B in the Japan Sea: Inserting globally correlated tephra ages into deep-sea sediments in a semi-closed seaOriginal Research · 2026
3TEPHRA FROM LACUSTRINE SEDIMENTS OF THE MAGADAN REGION2025
4Holocene sediments reveal accumulation rates across an onshore subduction thrust in northeastern Nankai Trough, JapanOriginal Research · 2026
5A widespread meter-thick turbidite in the Southern Kuril trench records the 13th-century megathrust earthquakeOriginal Research · 2026 · 2 citations

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