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Climbing ripples recording the change of tidal current condition in the middle Pleistocene Shimosa Group, Japan
Yokokawa, M.; Kishi, M.; Masuda, F.; Yamanaka, M. (1995). Climbing ripples recording the change of tidal current condition in the middle Pleistocene Shimosa Group, Japan, in: Flemming, B.W. et al. (Ed.) Tidal Signatures in Modern and Ancient Sediments. Special Publication of the International Association of Sedimentologists, 24: pp. 301-311
In: Flemming, B.W.; Bartholomä, A. (Ed.) (1995). Tidal Signatures in Modern and Ancient Sediments. Special Publication of the International Association of Sedimentologists, 24. Blackwell Science: Oxford. ISBN 0-86542-978-2. 358 pp., more
In: Special Publication of the International Association of Sedimentologists. Blackwell: Oxford. ISSN 0141-3600, more

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Keyword
    Marine

Authors  Top 
  • Yokokawa, M.
  • Kishi, M.
  • Masuda, F.
  • Yamanaka, M.

Abstract
    A lenticular sand body in the middle Pleistocene Shimosa Group in Japan, dominated by climbing ripple cross-lamination, is interpreted here as an estuarine or lagoonal deposit that accumulated under tidal influences. Based on the systematic change of sand-layer thickness in the alternation of sand and mud layers, two sets of four neap-spring tidal cycles are reconstructed from tidal flat deposits that occur just above the climbing-rippled sand. The climbing ripple cross-laminae occur as four different types which signify variable current velocities and sediment supply. lsochrons can be drawn through the climbing-rippled sand along individual bedding surfaces on detailed tracings of the climbing ripple cross-laminae. The dominant types of climbing ripple cross-lamination vary along each isochron. Cyclic variations in current velocity during a single tidal cycle are demonstrated from the vertical evolution in the types of climbing ripple cross-lamination.

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