3.84--3.07 billion years ago
Schedule of Events March--The crust continues to harden, forming continents and oceans.
Schedule of Events April 1st--Primitive life appears (cyano-bacteria) April--The crust continues to cool an thicken. The early forms of life develop very slowly.
Schedule of Events May--The crust continues to cool and thicken. The early forms of life develop very slowly.
