In some places, the rocks below the Great Unconformity are about 1.2 billion years older than those above it. This missing chapter in Earth’s history might be linked to a fracturing supercontinent, out-of-control glaciers, and maybe the diversification of life itself. 

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References: docs.google.com/document/d/1aVE7-Vt8yaMVvcAee5V9IOvmMjgxgb6SkMToDMJqQ7E/edit?usp=sharing