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Era 1: The Pre-Cambrian Era

  • Hadean Eon (4.6 BYA) - Earth was formed 4.6 BYA which began the Hadean Eon notable for atmospheric formation- igneous rock formation.

  • Archean Eon (3.8 BYA) - cyanobacteria developed and due to their processing of oxygen the atmosphere began to form- metamorphic rock formation.

  • Proterozoic Eon (2.5 BYA)- notable for first single cellular organism development - sedimentary rock formation.

  • 1.8 BYA - Emergence of first cell with a nucleus  

  • 750-635 MYA - Glacier formation began.

  • First multicellular organisms evolved due to increased oxygenation levels- some of them were soft-bodied sea creatures. 

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