Neoarchaean
Oxygenic photosynthesis first evolved in this era. This led to an oxygen catastrophe in the Palaeoproterozoic era. It was caused by a poisonous buildup of oxygen in the atmosphere. This was created by oxygen-producing photoautotrophs that evolved in the Neoarchaean. The supercontinent Kenorland formed during this period, about 2.7 billion years ago.