SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Plant fossils. Historical artwork of plant fossils in a specimen of argillaceous shale. Fossils are impressions left in rock that forms around objects buried in sediments or ash. Bony structures are most often fossilised, but soft plant tissues can also be fossilised under certain conditions. This is a clay-like (argillaceous) rock called shale. Shale is a fine-grained sedimentary rock that easily breaks apart into flat pieces, and is a good place to look for fossils. This specimen, which is 10 centimetres across, was obtained from a boring made at Stiring, Moselle, France. Artwork published in Mines and Miners (L. Simonin, 1868).
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