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Stromatolite Pyramid - The World's OLDEST Fossil!
Stromatolite Pyramid - The World's OLDEST Fossil!
Stromatolite Pyramid - The World's OLDEST Fossil!
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Stromatolite Pyramid - The World's OLDEST Fossil!

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Stromatolites are layered mounds, columns, and sheet-like sedimentary rocks. They were originally formed by the growth of layer upon layer of cyanobacteria, a single-celled photosynthesizing microbe that lives today in a wide range of environments ranging from the shallow shelf to lakes, rivers, and even soils. Cyanobacteria are prokaryotic cells (the simplest form of modern carbon-based life) in that they lack a DNA-packaging nucleus. Bacteria, including the photosynthetic cyanobacteria, were the only form of life on Earth for the first 2 billion years that life existed on Earth.