Polished Tiger Iron Specimen. Banded Iron Formation (BIF). Hamersley Iron District of Western Australia. Archean in Age 3.8-2.7 Billion Years Old. The oldest known Stromatolites (Cyanobacteria) date back to 3.74 Billion years. Consisting of 7/8 of all life that ever existed in the recorded fossil record. Stromatolites were the first organisms that used photosynthesis as […]