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Description: | Cyrtospirifer extensus was a brachiopod with a wide shell. This fossil, which is probably from the Delabole Slate of Cornwall, has been flattened and distorted as the shale that contained it was changed to slate by earth movements. These changes often resulted in fossils like this one becoming elongated. Quarrymen thought that these winged fossils looked a bit like butterflies, and because many of the fossils came from the delabole Quarry, brachiopods like this one became known as the Delabole Butterfly. | 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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