| P number: | P521056 |
|---|---|
| Caption: | A fossil specimen of Alethopteris decurrens Artis. A fossil plant. (Plantae.) Hamilton, Lanarkshire, Scotland. |
| Description: | Alethopteris decurrens is a seed fern from the Upper Carboniferous Coal Measures and was found in Hamilton. British Geological Survey Biostratigraphy Collection number GSE 4735. Fern-like fronds from Coal Measures time were not true ferns belonging to the Pteropsids but belonged to the Pteridosperms or seed-ferns, a group of now extinct plants that had seeds on their leaves and pollen-bearing sporangia on their fronds. Pteridosperms were plants which varied in form from small trees to scrambling creepers and lived mainly on the raised levees of rivers. Fragments of their leaves are abundant fossils of the Carboniferous Coal Measures forests when Neuropteris and Alethopteris were key genera. They belong to the larger grouping called gymnosperms which also includes the cycadophytes, ginkgos and conifers as well as seed ferns. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Portrait |
| Size: | 378.95 KB; 628 x 1000 pixels; 53 x 85 mm (print at 300 DPI); 166 x 265 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Best of BGS Images/ Fossils |
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