File:P521486.jpg
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Summary
Rock specimen of shale. Glenkiln Burn, Kirkmichael, Dumfriesshire. The sample is a black shale containing graptolite fossils on bedding surfaces. The shale is very fine-grained and thinly bedded. British Geological Survey Petrology Collection sample number EMC 3636. Large tracts of the Southern Uplands of Scotland are formed of shales. These rocks were deposited as sediments in a deep oceanic basin. They consist of very fine-grained minerals, mainly of clays and micas. The specimen of shale will belong to the Ordovician Glenkiln Shales. They are generally black shales yielding many species of graptolites, tiny colonial animals that lived in a series of interconnected tubes made from collagen. Each animal lived in a thecae that made up branches called stipes, the whole colony being called the rhabdosome. They were free floating animals in the Ordovician seas and have been used extensively to date the rocks in which they are found. P521486
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:51, 3 August 2015 | | 800 × 620 (126 KB) | JenniferFindlay1 (talk | contribs) | Rock specimen of shale. Glenkiln Burn, Kirkmichael, Dumfriesshire. The sample is a black shale containing graptolite fossils on bedding surfaces. The shale is very fine-grained and thinly bedded. British Geological Survey Petrology Collection sample nu... |
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