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Oracle bones are parts of shell or bone, typically from ox scapulae or turtle shells due to their flat facades. They were used as a form of astrology in early China, largely during the late Shang dynasty. Oracle bone script was the form of Chinese figures used on oracle bones animal bones or turtle plastrons practiced in the pyromantic forecast in the late 2nd millennium BCE and is the pioneer recognized the form of Chinese writing. The large preponderance were found at the Yinxu site.