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March 25, 2026BULLETIN OF THE GEOLOGICAL SURVEY OF JAPANOpen Access

Stratigraphic and tectonic implications of the Middle Miocene Shichiyama Formation, Tottori Group, eastern Tottori Prefecture, Japan

Toshiki Haji Kyoko Kanayama Takashi Kudo Yoshiaki Sugamori Sota Niki Takafumi Hirata

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Key Points

The aim is to clarify the stratigraphy and tectonics of the Middle Miocene Shichiyama Formation in Tottori Prefecture.
Conducted geological surveys and analyses of rock compositions.
Performed zircon U-Pb and K-Ar dating on rocks.
Classified the formations into different types based on composition and age.
Identified the Shichiyama Formation's stratigraphy dating back to 15.3–15.1 million years ago.
Confirmed volcanic and marine sediments, with inferred eruptive sources near Mount Shichiyama.
Noted a lack of direct tectonic links between the transitions in stratigraphy and folding observed offshore.

Implication

Geological survey identifies stratigraphy and dating of formations in Tottori, suggesting implications for local tectonics.

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Cite This Study

Haji et al. (2026) studied this question.

synapsesocial.com/papers/69ccb59f16edfba7beb87640 https://doi.org/10.9795/bullgsj.77.1_1

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