Part 3 history of the earth.docx

Part 3 history of the earth.docx - Stromatolites are...

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Stromatolites are layered moulds and columns that are especially sheet like sedimentary rocks. They develop from the growth of layer upon layer of cyanobacteria, that have been photosynthesizing living in the shallow shelf and lakes, rivers and soils. In the past these Stromatolites were the sedimentary structures produced by the sediment trapping, binding and precipitating from the phototrophic activity of microbes. They can be traced as far back as from 3.5 billion years to the Early Archean eon. Modern Stromatolites are known to have a biological origin. They are formed with the help of microbes which grow in a thin layer on the sea floor. They are blue-green bacteria with sticky nature and small
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