I 25* cal BP,2 25***

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1 The Quaternary Research /* + p 0+ 03,*++, +, 0, a, - * * * * * * * / *** 050** cal BP 15*** cal BP ** *4,1 +4,1 m *4/ *41 m 051** 050** cal BP : I 25*** cal BP,**225*** cal BP - m KAh + m 15*** /5-** cal BP 15*** 05*** cal +4* m +4/ m BP Bard et al, ** -5*** cal BP *4/ m,51**,5+** cal BP +33 ; Lambeck et al,,** +320 * /0 0 *, 1** 2/-* *- 0-* 2/11, 3 + *,1+ 2/+* 02 */,11 *20, --11 * /0 0 * a Corresponding author : h-sato@hitohaku jp

2 62 /* + 05*** yrs BP /5*** yrs BP *4/ m -5*** yrs BP Sato,**, 5-2* 5*3* cal BP *4-, *4-2 m +333 C,** +33,**,** II + + Fig + Location map of the Desaki Coast showing +333 the study site in the central part ofthe Seto,*** Inland Sea 3 DS * + +- * *4,, m, *4,0 m, *4-+ m, *40+ m, *433 m / b C,** C,**,** C Intcal * Reimer et al,,** CALIB/4*4, Stuiver et al,,**/ m *4++ m, *4+1 m, *4,0 m - III,** + C + + 2mm

3 ,*++, 63 Table + + C C dates of fossil woods collected from the peat deposits at the Desaki Coast RIMS20 *4+0 *4,+ m,** *4,+ *4-1, m *4-1 *41 m, cm,** *41 *41+ m DS+ *41+ +4** m + *420 mr+ +4** +4*2 m +4*2, *4-0 mr,,, +4+0 m,,** - +** cm *4,/ mm *4,+ m +4+0 m - /5*** 25*** cm + mm 3/ cm,** *4,, m, *4,0 m, *4-+ m, *40+ m, *433 m / C,** +/ 05+** /* /53/* 1* /53* 0* /53+* 0* /52,* /* yrs BP,** + C, s 0532* 15+0* 052/* 0513* 0531* 050* 0511*,** 053+* 050* 051* 0523* 050,* 050-* 051* S 05/** cal BP + Amphora Fragilariforma n virescens /** n +4/++ +4/ *4- +* C Tn AT : +33, ; +33/ +310 KAh : +312,** *4+1 m IV KAh *4+0 m + C KAh,** KAh 15-** cal BP +33/ ; Kitagawa et

4 64 /* +, C,** Fig, A diagram of sedimentary facies, C ages, the vertical profile of sulfur content, diatom assemblage, and plant macrofossils for the peat deposits at the Desaki Coast Based on Matsushita et al (,**) al, +33/ ;,**, Nitella, Spar-,** ganium Eleocharis Cla- Potamogeton dium chinense, - +* ++ *420 mr+, *4-0 mr, *4-, +4 m,,** +4* m*4+ m + Scirpus planiculmis Ruppia rostellata Najas marina Scirpus tabernaemontani *41+ m Fragilariforma virescens,*4* 0-4,

5 ,*++, 65 *40 m *41+ m *40 m Fragilariforma virescens Actinocyclus octonarius var tenellus F virescens *41+ *43 m *40 m Fragilariforma Amphora A proteus A a # mexicana-4, +33/ 1040,**/ Diploneis pseudovalis Navicula elegans *4-0 m Navicula yarrensis Rhopalodia gibberula +4, 14 Tryblionella lit- toralis * /41 Actinocyclus *432 m Amphora *4,0 m Cyclotella meneghiniana * Eunotia spp,4* 140 Gomphonema spp -41 /42 Nitzschia frustulum * +*40 Pin- *40+ m 15*** nularia viridis cal BP051** cal BP V + *41+ *43 m Amphora, A proteus,** John +32- *4,, m*433 m C 15*** cal BP 050** *420 m cal BP *40+ m*433 m,**2 Amphora 35*** 25*** cal BP 051** 050** cal BP 25*** cal BP - m KAh *432 m 15-** cal BP + m, 15*** cal BP + m 051** 050** cal BP 15*** /5-** cal BP 05-** cal BP,**2 Reading and Collinson, +330, 15-** 15*** cal BP, m,**2 15*** cal BP,**2TCMSL -

6 66 /* + - HHWL+, *4/ m TCMSL,**2 TCHHWL TCMSL +, +4* m Fig - Age-altitude plot showing peat accumulation and tendency of mid-holocene relative sea-level (RSL) rise Gray zone indicates probable range of the highest water level (HHWL +, ) derived from sedimentary environments of the peat deposits and the range is based on the present tidal range (*4/ m) between high water level and the highest water level The dashed line indicates probable tendency of RSL variation The thick line (TCMSL) indicates tectonically corrected paleo-mean sea-level curve obtained from the coast of Harimanada (Sato,,**2) The thin line (TCHHWL) is the highest paleo-water level by adding half of the present maximum tidal range ( +4* m) to the paleo-mean sea level (TCMSL) *** cal BP *41+ *43 m Amphora, 051** 050** cal BP +42* m *43* m,42* m+4* m +332 *4/* m - C *4,, ma*433 mb / * *4/* m HHWL+, A B *4,, *41, m * m A B *4,1 m, +4,1 m A B 15*** 050** cal BP ** *4,1 +4,1 m *41-4, mmyr transgressive overlapshennan et al, +32- *4,, ma -,**2 15*** cal BP - 15*** cal BP +4* mtcmsl,**2,42* m+4* m,4* m TCHHWL 15*** cal BP A *4,, *41, m 15***

7 ,*++, 67 cal BP +402,4+2 m 15*** cal BP *4, *4- mmyr 15*** 050** cal BP *41-4, mmyr 051** 050** cal BP Nakada et al, +332 *4/* m 15*** 050** cal BP ** 053** *4,1 +4,1 m *41 cal BP m -4, mmyr Sato et al,,**+,**-,**0,**2 15*** /5-** cal BP 15*** cal BP +4/ m +4* m +4/ 051** 050** cal BP +41 m 15*** 050** cal BP *4/ *41 m *4,1 +4,1 m *4, *4- mmyr 15*** 050** cal BP 15*** cal BP +4* m +4/ +41 m 15*** 050** cal BP *4/ *41 m 053** cal BP Sato et al,,**+,**-,**0 15*** 051** cal BP 051** 050** cal BP 050** cal BP - 050** cal BP 050** /5-** cal BP VI Bard, E, Hamelin, B, Arnold, M, Montaggioni, L, Cabioch, G, Faure, G and Rougerie, F ( +330) Deglacial,** sea-level record from Tahiti corals and the timing of global meltwater discharge Nature, -2,,,+, +320 C, : -0 // /20* 15*** 050** cal BP A +33/

8 68 /* / 3 Science +33/ Fragilaria Reimer, P J, Baillie, MGL, Bard, E, Bayliss, A, Beck, -,,1,-3 JW, Bertrand, C JH, Blackwell, PG, Buck, CE, John, J ( +32-) The diatom flora of the Swan River Burr, GS, Cutler, KB, Damon, PE, Edward, RL, Estuary, Western Australia -0* p, Bibliotheca Phy- Fairbanks, RG, Friedrich, M, Guilderson, TP, cologica, Band 0, J Cramer Hogg, AG, Hughen, KA, Kromer, B, McCormac, +332 / p G, Manning, S, Ramsey, CB, Reimer, RW, Remmele, S, Southon, JR, Stuiver, M, Talamo, S, Taylor, FW, Kitagawa, H, Fukusawa, H, Nakamura, T, Okamura, van der Plicht, J and Weyhenmeyer, CE (,**) M, Takemura, K, Hayashida, A and Yasuda, Y IntCal* terrestrial radiocarbon age calibration, * ( +33/ ) AMS C dating of the varved sediments from Lake Suigetsu, central Japan and atmospheric change during the late Pleistocene Radiocarbon, C,0 cal kyr BP Radiocarbon, 0, +*,3 +*/2 +33/ -1, *+ +*0 +33, Sato, H (,**,) Late Holocene diatom assemblages and sea-level observation at a site in Okayama City - 1- /2 along the northeastern coast of the Seto Inland Lambeck, K, Antonioli, F, Purcell, A and Silenzi, S Sea Nature and Human Activities, no 1,,1-- (,**) Sea-level change along the Italian coast for,**2 the past +*5*** yr Quaternary Science Reviews,,-, 1,1,/3 +/01 +/32 Sato, H, Okuno, J, Nakada, M and Maeda, Y (,**+) +310 Holocene uplift derived from relative sea-level re- Tn cords along the coast of westrn Kobe, Japan Quaternary +312 Science Reviews,,*, / Sato, H, Okuno, J, Katoh, S, Nakada, M, Maeda, Y and Kobayashi, F (,**-) Holocene crustal movement along the coast of western Kobe and the +33/,** Kobe earthquake, Japan Quaternary Science Reviews,,,, Sato, H, Okuno, J and Katoh, S (,**0) Evaluation of Holocene crustal movement in the Ako Plain, western Japan The Holocene, +0, /-- /, Shennan, I, Tooley, M J, Davis, M J and Haggart, BA ( +32-) Analysis and interpretation of Holocene sea- Nakada, M, Okuno, J, Yokoyama, Y, Nagaoka, S, level data Nature, -*,, * *0 Takano, S and Maeda, Y ( +332) Mido Holocene un- Stuiver, M, Reimer, P J and Reimer, R (,**/) CALIB derwater Jomon sites along the west coast of Kyu- /*, html http : //wwwcaliborg shu, Japan, and asthenospheric viscosity The Quaternary Research (DaiyonkioKenkyu), -1, -+/ -, ,-,**, -,2 +,,/,-0 +33,1* p Reading, HG and Collinson, JD ( +330) Clastic coasts Reading, HG (ed) Sedimentary environments : Pro-,**/ 12* p cesses, facies and stratigraphy : +/,-+, Blackwell

9 ,*++, 69 Re-examination of buried peat deposits at the Desaki Coast (Tamano City, Okayama Prefecture) in the central part of the Seto Inland Sea, with special reference to MidoHolocene relative sea-level variation +, 0, a, - Hiroshi Sato*, Sigeyuki Suzuki*, Mariko Matsushita*, Arata Momohara*, Yayoi Ueda*, Shigehiro Katoh* / 0 and Yasuo Maeda* + Peat deposits were found under the sand rate of RSL rise slowed down after ca 15*** cal beach on the Desaki Coast (Tamano City, Oka- BP RSLs have risen with an amplitude more yama Prefecture) in the central part of the Seto than *4,1 +4,1 m during the period from ca Inland Sea In this paper, we re-examined the 15*** to 050** cal BP (at a rate more than *41 paleoenvironmental data on the deposits re- -4, mm/yr), and reached the highest position ported by Matsushita et al (,**) The results at ca 051** 050** cal BP Using a RSL (HHWL) of analyses of sulfur contents, diatom fossils, index point of transgressive overlap with an and plant macrofossils in the deposits were altitude of *4,, m at ca 15*** cal BP, half of used along with C ages and the eruption age the present highest tidal range ( +4* m) near ( ca 15-** cal BP) of KikaioAkahoya tephra to the Desaki Coast, and tectonically corrected derive the depositional environments Peat de- sea-level position with an altitude of +4* m at positions occurred in a salt marsh developing ca 15*** cal BP along the coast of Harimanada in a tidal range between mean high water level in the eastern part of the Seto Inland Sea (Sato, and the highest water level (HHWL), closely,**1), tectonic subsidence is calculated as *4, related to midoholocene relative sea-level (RSL) *4- mm/yr at this site Thus, sea-level rise over variations The peat layer at this site was formed the period concerned depends mostly on the during a period ranging mainly from ca 15*** eustatic factor This study provides valuable to 050** cal BP, and its age corresponds to the information for midoholocene RSL variation period of midoholocene RSL highstand when a along the coast of the Seto Inland Sea Keywords : Desaki Coast, MidoHolocene, relative sea-level variation, peat deposit, diatom analysis * + Institute of Natural and Environmental Sciences, University of Hyogo 0 Yayoigaoka, Sanda, 003 +/0, Japan *, Graduate School of Natural Science and Technology, Okayama University -++ Tsushimanaka, Okayama, 1** 2/-*, Japan * - Nara Research Institute for Cultural Properties, 3 + Nijo, Nara, 0-* 2/11, Japan * Graduate School of Horiculture, Chiba University 02 Matsudo, Matsudo,,1+ 2/+*, Japan * / --11 Shukurenji, Kashiwa,,11 *20,, Japan * 0 Museum of Nature and Human Activities, Hyogo 0 Yayoigaoka, Sanda, 003 +/0, Japan * a Corresponding author : h-sato@hitohaku jp

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