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Description: | Most graptolite fossils are preserved flattened in shale (a sedimentary rock) with one or both edges having the appearance of a tiny saw blade. A magnifying glass will show quite a lot of detail, but the rarer three-dimensional fossils show much more. There were hundreds of different species, and scientists are able to tell the ages of rocks by identifying the type of graptolite fossils that are present. Graptolites are particularly important for dating rocks deposited during the Silurian and Ordovician periods (410 to 490 million years ago). This is an example of Didymograptus also known as the 'Tuning Fork' graptolite. | 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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Graptolite
Graptolites are the fossilised skeletons…
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