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set: fossils // series: fern // picture: Renaultia
Although it is of Upper Carboniferous age (315 million years), this small (30mm across) compression fossil is clearly recognisable as a part of a fern frond. The frond branches, leaf venation and sporangia (terminal on leaf lobes) can all be seen. This is an extinct fern, known as Renaultia (often called Sphenopteris), from the Coal Measures of Yorkshire, England. This fern grew as a ground dwelling plant on a river floodplain in the equatorial tropics. It is a typical example of plant fossils studied in Palaeobiology courses.