Mega‐plant fossils of the early‐middle Jomonzian age from the sub‐surface of Takamatsu city in Kagawa prefecture, northeastern Shikoku

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  • 香川県高松市地表下から産出した繩文前期〜中期の大型植物遺体

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Mega-plant remains were obtained from the subsurface deposits of Takamatsu City, Kagawa Prefecture, northeastern Shikoku. They are derived from a band of carbonaceous silty fine grained sand having radiocarbon age of 5,930 ± 170 y. B. P. at a depth of five meters and of carbonaceous clayey silt having radiocarbon age of 4,910 ± 140 y. B. P. at a depth of six meters. The former plant assemblage is composed of Abies sp., Tsuga sp., Quercus aliena Blume, Q. (Cyclobalanopsis) sp., Sapindus mukurossi Gaerten., Camellia japonica Sieb., Aesculus turbinata Blume and Styrax obassia Sieb. et Zucc. The latter is composed of Chamaecyparis obtusa Endl., Pinus thunbergii Parl., Quercus glauca Thunb., Q. cf. gilva Blume, Q. (Lenidobalanus) sp., Zelkova serrata Makino, Cinnamomum camphora Sieb., Mallotus japonicus (thunb.) Muell.Arg., Melia azedarach L. var. japonica Makino, Sapindus mukurossi Gaertn, Styrax japonica Sieb. et Zucc., Cornus cf. controversa Hemsl and Leguminosae gen. et sp. indet. etc. Judging from these assemblages it can be inferred the area was a warm temperate forest zone at that time, i. e. 5,930 ± 170 y. B. P. and 4,910 ± 140 y. B. P., in the early-middle Jomon period. Also, if there are no remains from Jomonzian people in these plant assemblages, one can infer that the climate of 5,930 ± 170 y. B. P. was more or less cool in comparison to the climate of 4,910 ± 140 y. B. P.

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