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It looks a bit like a flying saucer, but it has nothing to do with outer space. It's a stromatolite and it came out of the Boxley Quarry located off U. S. 460 right on the western edge of Bedford County.
What's a stromatolite?
Stromatolites are formed by mats of blue-green algae, also known as cyanobacteria. These microbes have chlorophyll and produce oxygen via as a byproduct of photosynthesis. They also secrete carbonate minerals which, mixed with any sediment that gets mixed up with the bacterial mat, form layers of stone.
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