650 Million Year-Old Reef Discovered in Australia’s Outback

Gavin Hudson — Mon, 22 Sep 2008 05:03:21 +0000

Scientists at the University of Melbourne have discovered the relics of a 650 million year-old reef in the Australian Outback. The reef is 10 times higher than the modern Great Barrier Reef and predates the evolution of animal life by at least 40 million years. It could also offer valuable information about climate change.

The reef is located in the Flinders Ranges of southeastern Australia (pictured here). When the reef was submerged, these mountains formed Australia’s eastern seaboard. Since then, tectonic and natural forces have combined to expose a section of the reef around 20 km (12.4 miles) wide. Despite its size and relative proximity to Whyalla, South Australia’s third most populous city, the reef remained hidden to science until this week.

The discovery is of tremendous scientific value in understanding the origins of modern life. Little is known about life before around 542 million years ago–the end of the Precambrian age–since discoveries of fossils this old are rare. To put the reef’s age in perspective, it predates the first known fish by about 150 million years and the first mammals by about 450 million years. The reef itself, the only one of its age ever discovered, is not composed of coral like today’s reefs. Most of the reef is made of layers of non-living stromatolite accretion formed by previously unknown unicellular organisms.

Green Options » University of Melbourne

650 Million Year-Old Reef Discovered in Australia’s Outback