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Description: | Some rocks of Ordovician and Silurian age contain the remains of numerous graptolites but no other fossils - as shown by this specimen. The black colour and fine texture of the rock containing these fossils suggest that it formed in deep dark water with little oxygen where no bottom-living animals could exist. The puzzle of the abundant graptolites can be explained by knowing that they floated near the surface of the sea in warm sunlit water. It was only after death that their skeletons sank to the lifeless seabed where they became covered in mud and fossilised. | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | fossils natural world | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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