P521055

Uploaded on:
11/03/2009 02:49:10
Type:
Digital Asset
File Size:
293.10 KB
Dimensions:
665 x 1000 pixels
3916 views 5 downloads
P number: P521055
Caption: A fossil specimen of Mariopteris nervosa Brongniart. A fossil plant. (Plantae.) Hamilton, Lanarkshire, Scotland.
Description: A pteridosperm (seed fern) somewhat like Sphenopteris in form, i.e. with fern-like fronds. It also has features of the Pecopteris type ie. fern-like frond with bluntly rounded leaflets attached to the axis by their whole base. British Geological Survey Biostratigraphy Collection number GSE 4733. Seed ferns evolved from ferns at the beginning of the Carboniferous. They differ from true ferns in having seed-bearing structures on their leaves. The Pteridosperms belong to the Gymnosperms, woody plants whose seeds are not held in fruits and have annual growths of secondary wood, including seed ferns, cycads, ginkgos and conifers. This specimen is from the Upper Carboniferous.
Date taken: 01/01/2003
Photographer: Unknown
Copyright statement: NERC
Orientation: Portrait
Size: 293.10 KB; 665 x 1000 pixels; 56 x 85 mm (print at 300 DPI); 176 x 265 mm (screen at 96 DPI);
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Categories: Best of BGS Images/ Fossils  

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