In the southern end of Oshima Peninsula in the Satsumon era, corresponding to the preceding stage of the Ainu culture establishment, the Aonae culture had been established, which was the Creole style culture, produced between Satsumon culture and Honshu (main island of Japan) Haji ware culture.
渡島半島の南端にはアイヌ文化成立の前段階である擦文時代には擦文文化と本州土師器文化の間に生じたクレオール的文化である青苗文化が成立していた。