Hamelin Pool Stromatolites

About

Hamelin Pool contains the world's most diverse and abundant community of living stromatolites — microbial mats that build layered rock structures and represent the oldest known form of life on Earth, dating back 3.5 billion years. The enclosed hypersaline bay creates conditions where these ancient organisms, which once oxygenated the entire atmosphere, can still grow today. A boardwalk allows close-up viewing of these remarkable living fossils.

History & Significance

Hamelin Pool's stromatolites are among Earth's oldest known life forms, dating back 3.5 billion years. These microbial mats were responsible for oxygenating the planet's atmosphere during the Archaean and Proterozoic eons. The pool's hypersaline conditions (twice as salty as seawater) create a unique environment where stromatolite growth continues today, making it the world's most diverse living stromatolite community. The site was inscribed as a UNESCO World Heritage Site as part of Shark Bay in 1991.

Getting There

Visitor Tips

• •Visit early morning for calmest reflections in the water
• •The old Hamelin Pool Telegraph Station is a fascinating heritage stop
• •Pick up the self-guided interpretive brochure at the start of the boardwalk
• •Stromatolites grow only 1 mm per year — treat with absolute care

Cultural Significance

Hamelin Pool's stromatolites are among Earth's oldest known life forms, dating back 3.5 billion years. These microbial mats were responsible for oxygenating the planet's atmosphere during the Archaean and Proterozoic eons. The pool's hypersaline conditions (twice as salty as seawater) create a unique environment where stromatolite growth continues today, making it the world's most diverse living stromatolite community. The site was inscribed as a UNESCO World Heritage Site as part of Shark Bay in 1991.