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Raised beach : ウィキペディア英語版
Raised beach

A raised beach, marine terrace, or perched coastline is an emergent coastal landform. Raised beaches and marine terraces are beaches or wave-cut platforms raised above the shore line by a relative fall in the sea level.〔http://www.sdnhm.org/research/paleontology/sdshoreline.html〕
Around the world, a combination of tectonic coastal uplift and Quaternary sea-level fluctuations has resulted in the formation of marine terrace sequences, most of which were formed during separate interglacial highstands that can be correlated to Marine Oxygen Isotopic Stages (MIS) (for example, Johnson and Libbey (1997).〔Johnson ME and Libbey LK. (1997). Global review of Upper Pleistocene (Substage 5e) Rocky Shores: tectonic segregation, substrate variation and biological diversity. ''Journal of Coastal Research''.〕
A marine terrace commonly retains a shoreline angle or inner edge, the slope inflection between the marine abrasion platform and the associated paleo sea-cliff. The shoreline angle represents the maximum shoreline of a transgression and therefore a paleo sea level.
== Origin ==

It is now widely thought that marine terraces are formed during the separated highstands of interglacial stages correlated to Marine Oxygen Isotopic Stages (MIS) (James et al., 1971;〔James, N.P., Mountjoy, E.W. and Omura, A., 1971. An early Wisconsin reef Terrace at Barbados, West Indies, and its climatic implications. Geological Society of America Bulletin, 82: 2011-2018.here〕 Chappell, 1974;〔Chappell, J., 1974. Geology of coral terraces, Huon Peninsula, New Guinea: a study of Quaternary tectonic movements and sea Level changes. Geological Society of America Bulletin, 85: 553-570.〕 Bull, 1985;〔Bull, W.B., 1985. Correlation of flights of global marine terraces. In: Morisawa M. & Hack J. (Editor), 15th Annual Geomorphology Symposium. Hemel Hempstead, State University of New York at Binghamton, pp. 129-152.〕 Ota, 1986;〔Ota, Y., 1986. Marine terraces as reference surfaces in late Quaternary tectonics studies:examples from the Pacific Rim. Royal Society of New Zealand, 24: 357-375.〕 Muhs et al., 1990〔Muhs, D.R. et al., 1990. Age Estimates and Uplift Rates for Late Pleistocene Marine Terraces: Southern Oregon Portion of the Cascadia Forearc. Journal of Geophysical Research, 95(B5): 6685-6688.〕).

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