Journal of the Sedimentological Society of Japan
Online ISSN : 1882-9457
Print ISSN : 1342-310X
ISSN-L : 1342-310X
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Volume 77, Issue 2
Displaying 1-8 of 8 articles from this issue
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  • Supercritical-flow sedimentary structures of fluvial deposits in the Plio-Pleistocene Katata Formation, Kobiwako Group, Japan
    Fujio Masuda, Noboru Hattori, Shiro Ishida
    2019 Volume 77 Issue 2 Pages 81-95
    Published: February 01, 2019
    Released on J-STAGE: May 08, 2019
    DOIhttps://doi.org/10.4096/jssj.77.81
    JOURNAL FREE ACCESS
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    Sedimentary structures related to supercritical-flows, including antidunes, chutes-and-pools and cyclic steps, have been identified from fluvial flood deposits in the Plio-Pleistocene Katata Formation, Kobiwako Group, Shiga, Japan. The characteristics of sedimentary structures by high-energy flood flows are 1) backset laminae and back-stepping lamina sets with up-stream migration, 2) sigmoidal, wavy and HCS-mimics laminae, 3) scour and fill gravel, sand and mud, 4) cyclically scoured erosional bases, and 5) mixed beds with heterolithic and well and poorly sorted deposits. The observed sedimentary structures considered as supercritical-flow deposits have high diversity. The deposits with much mud-content show fast sedimentation rate from the supercritical-flows contained large amount of suspended mud. We have to observe furthermore the sedimentary structures linked to supercritical-flow bedforms from deposits of various ages, areas and depositional environments.

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