1. (Jeffrey Smith per Keith Wilson, July 8, 2008) Ceremonial Objects added as secondary classification.
2. (Susan Kitsoulis per Keith Wilson, April 20, 2010) Object name changed from "Disk" to "Ceremonial Objects." Title changed from "Ritual disk, bi 璧" to "Disk (bi 璧)."
3. (Jeffrey Smith per Janet Douglas, June 17, 2010) Nephrite added as modifier to existing medium of "jade" based on conservation analysis.
4. (Jeffrey Smith per Keith Wilson, April 14, 2016) Quijia culture. Period changed from Neolithic period to Late Neolithic period; geography changed from Guangdong province or Jiangsu province, China to Northwest China.
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