Chiba Prefecture Historic Site • . Located within the grounds of Awa Shrine, this cave was discovered by chance in 1932, about one meter below the surface, during reconstruction work following the
Great Kanto Earthquake. The cave, measuring approximately 11 meters in length, two meters in height, and 1.5 meters in width, is a
sea cave with an opening in the northeast. A
rescue archaeology excavation was conducted, unearthing 22 human bones, 193 shell bracelets, three stone beads, and pottery. While reports at the time identified the pottery as
Yayoi pottery, current opinion is that it is Tōkai-type pottery from the end of the Late
Jōmon period. Of the 22 human bones excavated, 15 showed signs of
tooth ablation, which was a common practice in Japan from the late to final Jomon period. Some of the discovered human bones were reburied at the "Imbezuka, " which is believe to be the
burial mound of the ancestors of the Imbe clan. ==See also==