MICHAEL ABBEY / SCIENCE PHOTO LIBRARY MICHAEL ABBEY / SCIENCE PHOTO LIBRARY
Fossil cyanobacteria. Light micrograph of fossilised Chlorellopsis coloniata (ovals), a type of freshwater cyanobacterium (blue-green alga). These specimens, from the Eocene epoch (55-38 million years ago), were found in Wyoming, USA. Brightfield illumination. Magnification: x25 at 35mm size.
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