There was once a group of valuable ruins in this area.
In Ota Ward, large shell middens have been discovered in Omori, Magome, Yukidani, Numabe, and Chidorikubo (Omori Daiichi Junior High School in Kugahara).
Among them, the Chidorikubo Shell Midden is located at the back of a cove with a staggered shape, and is thought to have been a good docking place for simple rafts or dugout boats in primitive times. Therefore, it is thought that there were quite a number of villages during the Jomon period (middle to late Jomon period). More than 10 human bones were unearthed from this shell mound, as well as stone axes, stone swords, clay figurines, and rock figurines. These are still preserved at the University of Tokyo, Kokugakuin University, and the former Seven Junior High Schools.
Many traces of Yayoi-style pit dwellings from this era have been discovered on the Kugahara Plateau since 1929. There are two branch valleys on the Kugahara Plateau that have been eroded from east to west.At the back of the branch valley on the east side is the Kugahara Shell Mound (near Kugahara Elementary School), and at the back of the branch valley on the west side is the Chidorikubo Shell Mound. , the Yayoi style housing welfare group overlaps with these
かつてこの辺りにも、貴重な遺跡群がありました。
大田区内では、大森・馬込・雪谷・沼部・千鳥窪（久が原の大森第七中学）に大きな貝塚が発見されています。
なかでも千鳥窪貝塚は、千鳥形に湾入した入江の奥にあって、原始時代の簡単な筏か丸木船などの良い船着き場だったと思われます。ですから、縄文時代（中期～後期）には、かなり多くの集落があったと考えられます。この貝塚からは、石斧・石剣・土偶・岩偶などのほか人骨も10体以上、出土。これらは今でも東大・国学院大・先の七中などに保存されています。
こうした時代の弥生式竪穴住居の跡が、昭和２年以来、久が原台地に数多く発見されました。久が原台地には東西から浸蝕された二つの枝谷があって東側の枝谷の奥には「久が原貝塚」（久が原小学校付近）、西側に枝谷の奥には「千鳥窪貝塚」がつくられ、弥生式住居祉群はこれらと重複しています。
歴史ある場所にキャッシュを設置しました。
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