North Pole Dome Stromatolite: Archean Age (3.49 Billion years ago), from North Pole Dome, Pilbara, Western Australia, polished slice, 351g, about 13 x 8 cm, a highly detailed representation of early life and its chemical activity. [These stromatolites have recently been declared the oldest known, slightly older than the Strelley Pool Stromatolites; orignally formed by the growth of layer upon layer of cynabacteria - a single-celled photosynthesizing microbe - ossilized stromatolites provide a record of ancient life on earth. Rare: very little has been legally collected from Australia]