Fossilised algae

Fossilised algae

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Credit: SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY

Caption: Stromatolite. Stromatolite fossil showing a concentric banding pattern. Stromatolites are large, stony, cushion-like masses, composed of numerous layers of cyanobacteria (blue-green algae) which have been preserved due to their ability to secrete calcium carbonate. They are among the oldest organic remains to have been found. This specimen dates from around 2.4 billion years ago. Stromatolite formation reached a peak during the late Precambrian period (4000- 570 million years ago), but is still occurring today. This specimen was found in Argentina.

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Keywords: algae, animal, animals, blue-green algae, cyanobacteria, fossil, fossil invertebrate, fossilised, fossils, invertebrates, palaeontology, paleontology, stromatolite

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