|The Strelley Pool Chert rock formation in in the Pilbara region of Western Australia preserve an environment that existed 3.43 billion years ago, including several kinds of stromatolites. |
Stromatolites have traditionally been defined as remains of ancient life formsómicrobial mats that mixed with mud and built up rock-like structures.
Palaeontologists and geologists conclude that this area was once submerged under the ocean and formed a fairly flat area, perhaps the floor of a shallow ocean. As this now-arid region was once underwater, stromatolite-forming microbes would have thrived in a shallow sea where the water kept them moist but the Sunís rays could still penetrate and fuel photosynthesis.