A template for an improved rock-based subdivision of the pre-Cryogenian timescale

  title={A template for an improved rock-based subdivision of the pre-Cryogenian timescale},
  author={Graham A. Shields and Rob A. Strachan and Susannah M. Porter and Galen P. Halverson and Francis A. Macdonald and Kenneth A. Plumb and Carlos J. de Alvarenga and Dhiraj M. Banerjee and Andrey Bekker and W Bleeker and Alexander T. Brasier and Partha Pratim Chakraborty and Alan Stephen Collins and Kent C. Condie and Kaushik Das and David A. D. Evans and Richard E. Ernst and Anthony E. Fallick and Hartwig E. Frimmel and Reinhardt A. Fuck and Paul Hoffman and Balz S. Kamber and Anton B. Kuznetsov and Ross N. Mitchell and Daniel Gustavo Poir{\'e} and Simon W. Poulton and Robert Riding and Mukund Sharma and Craig Storey and Eva Stueeken and Rosalie Tostevin and Elizabeth C Turner and Shuhai Xiao and Shuanhong Zhang and Ying Zhou and Maoyan Zhu},
  journal={Journal of the Geological Society},
The geological timescale before 720 Ma uses rounded absolute ages rather than specific events recorded in rocks to subdivide time. This has led increasingly to mismatches between subdivisions and the features for which they were named. Here we review the formal processes that led to the current timescale, outline rock-based concepts that could be used to subdivide pre-Cryogenian time and propose revisions. An appraisal of the Precambrian rock record confirms that purely chronostratigraphic… 

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