Precursors
It is certain that Shang-lineage writing underwent a period of development before the Anyang oracle bone script, because of its mature nature. However, no significant quantity of clearly identifiable writing from before or during the early to middle Shang cultural period has been discovered. The few Neolithic symbols found on pottery, jade, or bone at a variety of cultural sites in China are very controversial, and there is no consensus that any of them are directly related to the Shang oracle bone script.
Read more about this topic: Oracle Bone Script