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      - Neoproterozoic
        
        Cryogenian (1)
        
        Ediacaran (4)
        
        Riphean (1)
      - Paleoproterozoic (3)
- problematic fossils (1)
- Red Sea region (1)
- reefs (8)
- remote sensing (3)
- reservoirs (1)
- sea water (3)