Earth’s evolution: Fresh insights from rocks formed 3.5 billion years ago

Mount Everest

An aerial view of Mount Everest. 

Photo credit: File

What you need to know:

  • The craton’s oldest rock assemblages are largely volcanic and sedimentary rocks also known as greenstone successions.
  • Greenstones are rock assemblages made up mostly of sub-marine volcanic rocks with minor sedimentary rocks.