The document appears to be a timeline or history of Japan from prehistoric to modern times. It includes dates and periods such as the Jomon period from 10,000-300 BC, the Yayoi period from 300 BC-300 AD, and later periods such as Heian, Kamakura, Muromachi, Edo, and the modern era. The document contains mainly Japanese text with some dates and contains copyright information for NTT Communications Corporation.