thumb|upright|170px|Ancient shells found in the Morinomiya kaizuka (Jomon period) The earliest evidence of settlements in the Osaka area are the which is located in the central Chuo-ku district. Buried human skeletons and a kaizuka (a mound containing remains), were found as well as shell mounds, oysters, and other interesting archeological discoveries from the Jomon period. In addition to the remains of consumed food, there were arrow heads, stone tools, fishing hooks and crockery with remains from rice processing. It is estimated that the ruins contain 2,000-year-old debris between the Jomon and Yayoi period. The findings of the archeological sites are exhibited in an adjacent building.
thumb|upright|170px|Ancient shells found in the Morinomiya kaizuka (Jomon period) The earliest evidence of settlements in the Osaka area are the which is located in the central Chuo-ku district. Buried human skeletons and a kaizuka (a mound containing remains), were found as well as shell mounds, oysters, and other interesting archeological discoveries from the Jomon period. In addition to the remains of consumed food, there were arrow heads, stone tools, fishin.g hooks and crockery with remains from rice processing. It is estimated that the ruins contain 2,000-year-old debris between the Jomon and Yayoi period The findings of the archeological sites are exhibited in an adjacent building.