| P number: | P521174 |
|---|---|
| Caption: | A fossil specimen of Dicranograptus rectus. A fossil graptolite. (Graptolithina.) Water of Deugh , Kirkcudbrightshire, Scotland. |
| Description: | Dicranograptus rectus is a graptolite from the Middle Ordovician gracilis Biozone from the Water of Deugh. British Geological Survey Biostratigraphy Collection number GSE 15115. Its rhabdosome starts as biserial and scandent while changing distally to two uniserial reclined stipes. To geologists graptolites are excellent stratigraphical indicators and have been used to subdivide the Ordovician and Silurian into eleven and thirty-two zones respectively. Individual graptolite zones are defined on the time range of a particular short-ranged species or group of species. A range of successive graptolite faunas has also been identified from the anisograptid fauna of the Tremadocian, the dichograptid fauna of the Arenig (Ordovician) through the diplograptid fauna and finally the Silurian monograptid fauna. Fig. Mem.for Geology of Carrick and Doon Sheets 8W/8E, fig.5l. |
| Date taken: | Wed Jan 01 00:00:00 GMT 2003 |
| Photographer: | Unknown |
| Copyright statement: | NERC |
| Orientation: | Landscape |
| Size: | 341.34 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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