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Why were oracle bone inscriptions important for dating the Shang dynasty?

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Map of eastern Asia highlighting the province of Henan in central China in orange, with its capital Zhengzhou labeled. Surrounding countries and major international boundaries are shown, along with a small inset map locating Henan within all of China. — Henan Henan province, China.

Oracle bone inscriptions were crucial for dating the Shang dynasty because they provided the first authentic, contemporary written evidence of the civilization, transforming it from a period long considered legendary by scholars into a historically verified era.1

Discovered at Yinxu—the site of the last Shang capital in Anyang, Henan province—these inscriptions consist of records of royal divination carved onto turtle shells and ox scapulae. Their importance lies in several key factors:231

Historical Verification: The inscriptions serve as a primary source that separates historical fact from historiographic legend, confirming the existence and political structure of the Shang state.1
Chronological Data: The bones often record specific details, including the date of the divination, the name of the presiding diviner, the subject of the inquiry, and the resulting prognostication.4
Systematic Evidence: Scientific excavations at the Yinxu site uncovered these artifacts in context with other remains, such as palace foundations and royal cemeteries, providing conclusive archaeological proof of the dynasty's timeline and advanced civilization.23

These jiaguwen records represent the earliest known body of Chinese writing, offering a direct link to the historical reality of the Shang period.14