| P number: | P521139 |
|---|---|
| Caption: | A fossil specimen of Amphigratus divergens (Hall) var. radiata Lapworth. A fossil graptolite. (Graptolithina.) Hartfell Spa, north branch of Auchencat Burn, 4 miles Slightly east of north of Moffat, Dumfriesshire, Scotland. |
| Description: | Amphigratus belongs to the family Leptograptidae, a family of uniserial, bilaterally symmetrical graptolites with two slender, straight, flexous stipes from the Middle Ordovician Hartfell Shales. British Geological Survey Biostratigraphy Collection number GSE 5533. Green Spot. This is an important 'Figured' specimen. The Hartfell Shales are typically developed on the 'Score' at Hartfell Spa, 7 km. north of Moffat and form the middle member of the graptolitic shales of the Moffat Series. They are about 30 m. thick and comprise a lower group of graptolitic black shales and an upper group the Barren Mudstones. The lower group are highly fossiliferous with graptolites and brachiopods. The distribution of graptolites on a global scale varied in the Ordovician. In the early Arenig most graptolite genera had a cosmopolitan distribution but from the later Arenig onwards there were two well-defined faunal provinces, the 'Atlantic' and the 'Pacific' provinces. Figd. G.L. Elles & E.M.R. Wood, Mon. Pal. Soc. 1903, pl. XVIII, fig. 2c. |
| Date taken: | 01/01/2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 239.93 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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