precambrian

antly microbial mats and stromatolites. Features: Formation of the Earth's first continents Emergence of photosynthetic bacteria Oxygen production begins, leading to the Great Oxidation Event Advantages: Connects geological and biological evolution Highlights early bio

earliest landmasses were small and highly unstable but gradually coalesced into larger continental blocks known as cratons. The most ancient cratons, like the Kaapvaal and Yilgarn in Africa and Australia, contain some of the ol