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Description: | Graptolites were microscopic animals which lived in the sea. Their skeletons are made from a mineral called chitin, and shaped into a series of very small tubes that are joined together. Graptolites lived near the surface of the sea supported by floats. When they died the skeletons sank to the seabed and became fossilised. The fossilised remains of Graptolites are common in rocks of Ordovician and Silurian age but they became extinct at the end of the Carboniferous period. | 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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