| P number: | P521134 |
|---|---|
| Caption: | A fossil specimen of Diplograptus vesiculosus Nicholson var. penna Hopkinson. A fossil graptolite. (Graptolithina.) Dobb's Linn 3/8 m. west of Birkhill, 9.25 miles north-east of Moffat, Dumfriesshire, Scotland. |
| Description: | Diplograptus is a biserial, scandent form of graptolite i.e. it has two rows of thecae growing back to back with the stipes growing upward from the sicula with the thecae facing outwards. The thecae are straight or show a slight sigmoidal curvature. British Geological Survey Biostratigraphy Collection number GSE 640. Green Spot. They lived from the Llanvirn (Middle Ordovician) to the Llandovery (Lower Silurian). The graptolites secreted a proteinaceous skeleton called the rhabdosome which starts in a tiny conical cup, the sicula. Stipes, long slender branches grew from this with short overlapping tubes called thecae. Each thecae housed an individual zooid or member of the colony. This specimen is possibly from the Birkhill Shales and is of Silurian in age. It was found at Dobb's Linn 3/8 m. west of Birkhill, 9.25 miles north-east of Moffat. Figd. G.L. Elles & E.M.R. Wood, `Brit. Graptolites` Mon. Pal. Soc. 1907, pl. XXVIII, fig. 9c. |
| Date taken: | 01/01/2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 378.77 KB; 1000 x 665 pixels; 85 x 56 mm (print at 300 DPI); 265 x 176 mm (screen at 96 DPI); |
| Average Rating: | Not yet rated |
| Categories: | Unsorted Images |
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