Stromatolite fossil

Stromatolite fossil

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This image is part of the feature Fossils: Life On Earth

Credit: SINCLAIR STAMMERS/SCIENCE PHOTO LIBRARY

Caption: Stromatolite fossil cut away to reveal the internal concentric banding. 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, the oldest structures dating from over 3000 million years ago. Stromatolite formation reached a peak during the late Precambrian period, but is still occuring today. Present-day formations can be seen in the Everglades, Florida, USA, and in Shark Bay, Australia.

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Keywords: animal, animals, fossil, fossil invertebrate, fossils, invertebrates, palaeontology, paleontology, stromatolite

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