Ancient life’s record in Western Australia faces threats
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Researchers in Australia reviewed 50 years of study on microbialites, structures created by ancient microbial communities, and found these records of early life are vulnerable to damage.
Western Australia holds some of the oldest known microbialites, dating back nearly 3.5 billion years in the Pilbara region, and living examples in Shark Bay. Scientists study these formations to understand the evolution of life on Earth, how the atmosphere gained oxygen, and potentially where to search for life on other planets.
Modern microbialite sites act as important comparisons for their fossilized counterparts, sometimes called a “Rosetta Stone” for understanding ancient structures. The record also reveals how life responded to past mass extinction events, with increases in microbialites sometimes preceding or coinciding with ecological disruption. However, scientists still debate how to differentiate structures created by living organisms from those formed by non-biological processes, and they lack complete understanding of the environments where ancient microbialites formed. Despite their age, microbialites are fragile.
Living examples grow very slowly, meaning damage from tourism or environmental changes can take centuries to heal. Fossil sites also face threats from collecting and scientific sampling. The researchers note that Australia lacks sufficient resources and national frameworks to protect these geoheritage sites, and the outlook for their preservation is poor.
