Middle to late Pleistocene shallow marine deposits in the southeastern part of the Kanto Plains, central Japan, yield well-preserved specimens of the trace fossil Rosselia socialis Dahmer, 1937, a vertical, spindle-shaped mud-lined tube. Aside from such spindle-like specimens, peculiar specimens characterized by their long, vertically stacked forms have also been observed. Detailed observations of the stacked specimens and the sedimentary structures of the host sediment reveal that these burrows were formed as the result of the response of the trace-maker to depositional events. The characteristic mode of occurrence of the specimens can be used as a measuring stick not only for the magnitude of erosion and subsequent deposition of the host sediment, but also for the relative frequency of the depositional events, despite bioturbation of the host sediment. This technique can be applied readily to fine-scale stratigraphic and/or paleoenvironmental analyses.

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