MICHAEL ABBEY / SCIENCE PHOTO LIBRARY MICHAEL ABBEY / SCIENCE PHOTO LIBRARY
Fossilised algal spores. Light micrograph of fossilised spores or cysts of Tasmanites sp., a type of marine green alga. These specimens are from a shale, a type of sedimentary rock that is largely composed of clay, which was laid down during the Devonian period (395-345 million years ago). The shale is from Kentucky, USA. Darkfield illumination. Magnification: x25 at 35mm size.
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