Boring Billion
Earth history between 1.8 and 0.8 billion years ago, characterized by tectonic stability, climatic stasis, and a slow biological evolution with very low oxygen levels and no evidence of glaciation
en-GB/ˈbɔːɹɪŋ ˈbɪlɪəŋ/
en-US/ˈbɔɹɪŋ ˈbɪljən/