Stromatolites in Shark Bay, Australia - stromatolites are "living fossils" formed by bacteria colonies. Stromatolites formed in shallow seas more than 3 billion years ago.
"On the west coast of Australia, where the red outback meets the sea in the world heritage listed Francois Peron National Park." by Laurence Norah
Big Lagoon in Francois Peron National Park, Shark Bay, Western Australia