MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
Stromatolite fossil. Stromatolites are large, stony, cushion-like masses formed from many layers of cyanobacteria (blue-green algae). They have been preserved due to their ability to secrete calcium carbonate. They are among the oldest organic remains that have been found. This specimen is from the Precambrian epoch (4000 to 570 million years ago) and was found in Morocco.
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