
江戸川区は、縄文時代の頃(約5000年前)は、まだ海の底でした。 約3000年前頃から地盤が隆起したり、川から土砂が流れ込んだりして次第に陸地ができました。 江戸川区では弥生時代の後期頃(約1800年前)に小岩で人が住み始めました。これが上小岩遺跡です。   Source: Objaverse 1.0 / Sketchfab
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