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前寒武纪所占据的时间约为整个地球年龄的90%。过去前寒武纪地质年表的建立和划分,是建立在上世纪80年代的科学认知水平上,是以当时人们对于前寒武纪重大全球地质学事件的认识,以整数年龄值为标准,也就是所谓的全球标准地层年龄(Global Standard Stratigraphic Ages:GSSA)而制定的。显然,经过数十年科学技术的飞速发展,这样的年表已经远远不能满足地质科学发展的需要。为此。在2004年的国际地层委员会(International Commission on Stratigraphy,ICS)的一次年会上,正式明确了前寒武纪地质年表,必须在具体的重大地质事件的岩石记录的基础上,依据全球层型剖面和点(Global
Precambrian occupies about 90% of the entire Earth’s age. The establishment and division of the past Precambrian geological chronology was based on the scientific cognition level of the 1980s. Based on the understanding of major Precambrian major global geology events at the time, taking the integer age value as the standard , The so-called Global Standard Stratigraphic Ages (GSSA). Obviously, after decades of rapid development of science and technology, such chronology has far failed to meet the needs of the development of geological science. to this end. At an annual meeting of the International Commission on Stratigraphy (ICS) in 2004, the Precambrian geological chronology was formally established and must be based on rock records of specific major geological events and on the basis of global stratigraphic patterns Section and Point