Iwajuku Site Excavation Day

What Is Iwajuku Site Excavation Day?

September 11th marks the day in 1949 when a research team from Meiji University began a full-scale excavation of the Iwajuku archaeological site in Gunma Prefecture, one of the most significant investigations in the history of Japanese archaeology.

The Discovery That Proved Japan Had a Paleolithic Era

The excavation at Iwajuku overturned long-held assumptions about Japan's ancient past.

• How it began: Amateur archaeologist Tadahiro Aizawa discovered chipped stone tools within the Kanto loam layer, a layer of volcanic ash soil, sparking the investigation
• Full-scale excavation: On September 11, 1949, a research team from Meiji University arrived on site and began formal excavation work
• Historical significance: The excavation provided the first scientific proof that a Paleolithic era existed in Japan, predating the Jomon period
• Lasting impact: The discovery triggered a wave of Paleolithic site investigations across Japan

How One Self-Taught Researcher Rewrote Japanese Archaeology

Aizawa studied archaeology on his own while working as a traveling peddler. His willingness to question the academic assumptions of the time is often credited as the key to this landmark discovery, a striking example of curiosity reshaping the historical record.

Ways to Mark the Day

• Learn about the Iwajuku site and the Iwajuku Museum
• Read about the life and achievements of Tadahiro Aizawa
• Explore books or resources on Japan's Paleolithic era
• Visit a local museum or history center to see archaeological exhibits

Quiet Curiosity Can Rewrite History

Iwajuku Site Excavation Day marks a discovery that transformed Japan's understanding of its own past. On September 11th, take a moment to consider the traces of history that may lie hidden nearby.