Summary:

- Researchers have discovered a 2-billion-year-old rock formation in Gabon, Africa, that appears to have been created by ancient microbes.
- The rock formation, known as the Francevillian biosphere, is made up of layers of pyrite (fool's gold) that were likely formed by ancient microbes that metabolized iron and sulfur.
- This discovery provides valuable insights into the early history of life on Earth and the conditions that may have supported the development of primitive lifeforms billions of years ago.