Modernstromatolites growing in Shark Bay (Western Australia).Stromatolitesare sedimentary rocks form
Modernstromatolites growing in Shark Bay (Western Australia).Stromatolitesare sedimentary rocks formed by the growth of layers ofcyanobacteria, single-celled photosynthetic microbes. Stromatoliteshave been found as fossils in Early Archaean rocks from around 3.5billion years ago, in South Africa and Western Australia. Theirnumbers increased during the Archaean, but began to decline duringthe Proterozoic Era, and are not common today. -- source link
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