2005年工作进展：

（1）研究进展：

      本课题2004年5月—6月赴皖南和湖北峡东地区进行了野外考察，重点观察了震旦系陡山沱组底部盖帽白云岩，系统采集了皖南石盂剖面盖帽白云岩样品30余件，现已送样作碳、氧同位素分析。对峡东雾河剖面盖帽白云岩的观察和研究表明，马林诺冰期（Marinoan glaciation）后盖帽碳酸盐的一些典型特征，如似帐篷构造、重晶石沉积、文石晶扇构造和碳同位素负漂移现象，在雾河剖面都有表现。结合已经发表的同位素年龄数据，进一步证实了华南南沱冰期和澳大利亚的Marinoan冰期、纳米比亚的Ghaub冰期等可以进行对比。
    已完成“扬子区震旦系陡山沱组底部盖帽白云岩特征及其对比”一文的初稿。
（2）主要研究工作：

1. 进一步加强陡山沱组底部盖帽白云岩的野外观察，重点通过白云岩中外源砾石的沉积特征的观察和描述，以及不同相区盖帽白云岩的横向展布，探讨盖帽白云岩与下伏南沱组冰碛岩的接触关系及其蕴含的环境意义。

2. 完成已采样品的分析测试。

3. 室内研究，系统总结，完成“震旦系陡山沱阶底界的 界线层型”研究报告并提交论文。

（3）最新研究成果：

TERMINAL PROTEROZOIC SYSTEM - FIRST BALLOT
SECRETARY'S REPORT APRIL 12, 2000

     All voting members responded.  The result follows:
     I vote in favor of placing the initial GSSP of the terminal Proterozoic Period at a stratigraphic horizon characterized by:

    _1__   the base of the Varanger (or, Marinoan) glaciogenic succession.
   _16__  the base of, or a horizon within the cap carbonate interval
          immediately above Varanger (or, Marinoan) glacial beds.
   _1_  the first appearance of diverse Ediacaran macrofossil assemblages.

    Total number of Voting Members - 20
    Ballots Cast - 18
    Elected not to vote - 2

          Vote scrutineer:  Guy M. Narbonne 
          Secretary, IUGS Terminal Proterozoic Subcommission

TERMINAL PROTEROZOIC SYSTEM
18TH CIRCULAR - September 2003 
I.U.G.S. SUBCOMMISSION ON THE TERMINAL PROTEROZOIC SYSTEM

TPS SUBCOMMISSION APPROVES A GSSP AND NAME FOR A NEW TERMINAL PROTEROZOIC SYSTEM
Question 1: The initial GSSP of the new, terminal Proterozoic period shall be placed at the base of the Nuccaleena Formation cap carbonate, immediately above the Elatina diamictite in the Enorama Creek section, Flinders Ranges, South Australia.
Approved by 16 of 18 voting-member ballots cast on this question (89%).
100% participation by the 20 voting members, with 2 declared abstentions.

Question 2: The terminal Proterozoic Period shall be named the Ediacaran Period.
Approved by 15 of 19 voting-member ballots cast on this question (79%).
100% participation by the 20 voting members, with 1 declared abstention.

RESULTS OF THE THIRD BALLOT

Question 1: The initial GSSP of the new, terminal Proterozoic period shall be placed at the base of the Nuccaleena Formation cap carbonate, immediately above the Elatina diamictite in the Enorama Creek section, Flinders Ranges, South Australia.

_16_ I approve (80% of eligible voters / 89% of votes cast on the question)
Janine Bertrand-Sarfati (France), Martin Brasier (UK), Nick Christie-Blick (USA), Ian Fairchild (UK), Gerhard Germs (South Africa), Brian Harland (UK), Hans Hofmann (Canada), Richard Jenkins (Australia), Andy Knoll (USA), Gopendra Kumar (India), Guy Narbonne (Canada), Wolfgang Preiss (Australia), Laurence Robb (South Africa), John Shergold (France), Anna Siedlecka (Norway), Malcolm Walter (Australia)
__2__ I disapprove
Mikhail Fedonkin (Russia), Mikhail Semikhatov (Russia)
__2__ I abstain
Sun Weiguo (China), Xing Yusheng (China)
__0__ Did not vote

RESULTS OF THE THIRD BALLOT