Diurnal inequality pattern of the tide in the upper Pleistocene Palaeo-Tokyo Bay: reconstruction from tidal deposits and growth-lines of fossil bivalves
Murakoshi, N.; Nakayama, N.; Masuda, F. (1995). Diurnal inequality pattern of the tide in the upper Pleistocene Palaeo-Tokyo Bay: reconstruction from tidal deposits and growth-lines of fossil bivalves, in: Flemming, B.W. et al. (Ed.) Tidal Signatures in Modern and Ancient Sediments. Special Publication of the International Association of Sedimentologists, 24: pp. 289-300
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; e-ISSN 2054-6610, more
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| Authors | | Top |
- Murakoshi, N.
- Nakayama, N.
- Masuda, F.
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| Abstract |
Tide-influenced estuarine sediments have been recognized within the upper Pleistocene Kioroshi Formation of central Japan. The tidal regime and diurnal inequality pattern in an embayment of Palaeo-Tokyo Bay were reconstructed from intertidal and subtidal sandwave deposits and also from the growth-line patterns of fossil bivalve shells which lived in the estuary. Mud couplets, regular thick-thin alternations and sinusoidal thickness variations with a cyclicity of about 27 bundles were recognized in the tidal bundle sequence. From the analyses of these tide-induced sedimentary structures, semi-diurnal or mixed tidal patterns were reconstructed. Similar analyses were made on bivalve shells. The internal growth lines and growth increments of the shells of Potamocorbicula amurensis Schrenck show single- and double-spaced growth increments, thickness alternations of growth increments, and thickness inversion of growth lines with a period of about 28 increments. From these analyses, semi-diurnal or mixed palaeotidal patterns with diurnal inequality in the ranges of both low tides and high tides were inferred. |
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