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Precambian
Alice Springs, Central Australia
These putative bacteria are believed to have produced stromatolites during photosynthesis as they oxidized amient iron and other heavy metals. That the latter were present in solution for the process to have taken place is strong evidence that in Precambian times there was extensive volcanic activity. The finding of stromatolites in Central Australia is equally interesting. In Precambian times the Australian land mass, together with what today is India, South America and Antarctica together formed a super-continent. This super continent, called Gondwana, was at the South Pole. About 90 million years ago it began to break up. The finding of bacterial remains in Australia supports the conclusion that at one time the South Polar climate was tropical or near tropical.