After Shell Beach we boarded the tour bus for the small settlement of Hamelin Pool. We are still in the Shark Bay World Heritage area of WA. Hamelin Pool is the home of the oldest life form on earth--Stromatolites. Recent research claims they were on earth 3,450 billion years ago. Modern ones are only found in two places in the world, The Bahamas and here in Shark Bay. Stromatolites were the first structures built by cyanobacteria which produced oxygen and so led the way for the development of plant and animal life. They need shallow, warm, salty water to grow.