Geologic time scale

• Massive, computer-analyzed geological database reveals chemistry of ancient ocean (15 Aug 2018)
  
• Geologist uncovers 2.5 billion-year-old fossils of bacteria that predate the formation of oxygen (05 Oct 2017)
  
• Cenozoic era: Facts about climate, animals & plants (12 Jun 2016)
  
• Epoch-defining study pinpoints when humans came to dominate planet Earth (10 Sep 2015)