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Earth’s First Landmass
November 16 , 2021
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- A new study suggests that the Earth's first continents, known as the cratons, emerged from the ocean between 3.3 billion and 3.2 billion years ago.
- This new study has challenged the widely accepted view that the continents rose from the oceans about 2.5 billion years ago.
- It has also found that the earliest continental landmass to emerge may have been Jharkhand’s Singhbhum region.
- The study found sandstones in Singhbhum with geological signatures of ancient river channels, tidal plains and beaches over 3.2 billion years old, representing the earliest crust exposed to air.
- The granites that form the continental crust of the Singhbhum region are 3.5 to 3.1 billion years old.
- The sandstones tell us ‘when the first landmasses were formed’ and the granite tells us ‘how the first landmasses were formed’.
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