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1999年12月3日至5日,全国地层委员会在北京召开各断代专业组工作会议,到会代表140人。此次工作会议是2000年第3次全国地层会议的准备会议,会议的主要任务是依据既考虑与国际接轨又符合中国地层特色的原则,讨论和商定各个断代的顶底界和分统的同位素年龄值;选定各个断代的建阶名
From December 3 to December 5, 1999, the National Stratigraphy Committee held a working conference for professional groups in various departments in Beijing, with 140 delegates attending the meeting. The working meeting was the preparatory meeting for the 3rd National Stratum Conference in 2000. The main task of the conference was to discuss and agree on the top-bottom and subsystems isotopes of each dynasty based on the principle of considering both international practice and stratum characteristics in China. Age value; select the name of each step of the hierarchy