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A stromatolite is an accreted mass of microorganisms or layered mounds, columns, and sheet-like sedimentary rocks.They were originally formed by the growth of layer upon layer of cyanobacteria.These organisms generate energy by using carbon dioxide and sunlight, and the byproducts are oxygen and calcium carbonate, also known as lime.
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A stromatolite is a calcaerous mound built up of layers of lime secreting  cyanobacteria
and trapped sediment, found in Precambrian rocks as the earliest known fossils, and still being formed in Lagoons in Australia.
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