Science: Microbes Demiurge of Australian Rocks

Society | June 9, 2006, Friday // 00:00

Odd-shaped rocks in the Pilbara region to the west of Australia offer compelling evidence they were built by microbes 3.43 billion years ago.

Scientists from Sydney believe the structures, known as stromatolites, could only have taken the forms they have if bacteria had been present.

The rocks' origin is disputed, with some claiming purely chemical processes could have made them.

A Nature journal study reveals their findings. Researchers have detailed an array of unusual sedimentary structures - seven clear types in all. Some look like upside-down ice cream cones; others resemble egg cartons.

These laminated structures have been described as stromatolites - the rock piles that in more recent settings are known to have been built by mats of microbes capturing grains and sticking them together.

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