Source of soft mudstone gravel in the Atami debris flow deposits based on a paleontological study

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The aim is to determine the source of gravel in debris flow deposits through paleontological data.
Micropaleontological analysis of debris flow deposits
Sedimentary age dating between 1.04 and 0.25 Ma
Identification of foraminiferal assemblages, especially Rotalinoides compressiuscula
The sedimentary age ranges from 1.04 to 0.25 Ma, possibly narrowed to 1.04 to 0.91 Ma.
The foraminifera community is characterized by a high occupancy of Rotalinoides compressiuscula at 63.8%.
No comparable natural occurrences of this species reported from the Kanto region, indicating a high likelihood of artificial exposure.

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Paleontological analysis identifies mudstone gravel source in debris flow deposits, suggesting artificial exposure origins.

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Kitamura et al. (2026) studied this question.

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