Can you imagine a time thousands of years before towering buildings and bustling streets? That time is connected to Kasori Shell Mounds. It is an archaeological site holding secrets of Japan’s Jōmon period.
Kasori Shell Mounds reveal much about life here long ago. This is the largest known shell midden in Japan. A midden is essentially a prehistoric trash heap. It is filled with discarded shells bones and other remnants of daily life.
Designated a National Historic Site the Kasori Shell Mounds offer a window into the Jōmon people. These people inhabited the Kantō region from around 4000 to 2500 BC. During this time sea levels were higher and the climate was warmer. Coastal settlements thrived.
The middens contain a treasure trove of information. They offer insight into the diets and habits of Jōmon society. The Kasori site specifically is massive. It stretches across a tongue-shaped plateau.
The northern Kasori Kita Shell Midden dates back 5000 years. It took over 1000 years to build. The southern Kasori Minami Shell Midden formed later. Its construction also spanned about 1000 years. This southern midden has a unique horseshoe shape. The two middens connect forming a figure eight when viewed from above.
Excavations revealed a variety of artifacts. Shells from clams and oysters are abundant. Fish bones from seabream and sea bass are also present. The Jōmon people gathered tree nuts. Chestnuts walnuts and acorns were common foods. They crafted fish hooks from boar and deer bones.
The site also contains remains of pit dwellings. Over 100 such dwellings have been identified. The largest had a diameter of over 19 meters. Human remains and dog bones were unearthed. This makes Kasori the largest known Jōmon settlement in the Tokyo Bay area.
Only a small portion of the Kasori Shell Mounds has been excavated. Much remains untouched. In 1986 the area became Kasori Kaizuka Park. The Kasori Shell Mounds Museum displays Jōmon artifacts. It explains daily life in the Jōmon period.
The museum showcases pottery stone tools and other objects. These offer a tangible connection to the past. You can almost hear the echoes of the Jōmon people as you wander through the park. Consider how their lives unfolded on this very spot millennia ago. The Kasori Shell Mounds stand as a reminder of their existence.