1975kaizuka 縄文時代前期の木製品（ｔｏｒｉｈａｍａ　） １９８０年

Kaizuka (shell mound) Ａ number of kaizuka (shell mounds) have been discovered all around japan, Ｂones of animals and fishes ，stone tools and pottery shards are excavated from these shell mounds ,whice help us to reconstrust ancient way of life. Torihama Shell Mound was formed between １２．000　and 5．500 years ago. 　Ｉt is a waterlogged site where archaeological remains are　found under thawaterlevel. This particular condition help preserve organic remains, which usually decompose over time . Ｔhus Ｔorihama Ｓhell Ｍound is just like a natural archive where archaeological remains are stored in an exceptional condition. Shell ｍｏｕｎｄｓ　ａｒｅ　ｇｅｎｅｒａｌｌｙ　thought to be garbage trash of the ancient people, because many objects used in daily life are found from shell mounds. Various plant remains (woods, leaves, seeds, bulbs, nut shells and pollens), animal remains (mammal bones, fish bones, coprolites, insects) and artificts (wood crafts, pottery, stone tools, basketry, ropes as well as worked shells, bones and antlers) were discovered from Torihama Shell Mound. All these archaeological remains now freshly revive in fromt of us in their original shapes..。