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Description: | Cone-in-cone is not a fossil. Rather, it is a structure that forms in mudstones (rocks that are made from finer grains than sandstones and siltstones), when calcium carbonate (calcite) separates out from the other minerals in the rock to form cone-like shapes. It is caused by pressure. Cone-in-cone can easily be mistaken for a fossil, especially plants, because it is common in some of the Carboniferous plant-bearing rocks of Northumberland. | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | rocks and minerals natural world | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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coal shavings
*non loc.* [Carboniferous] 'Cone-in-cone' structures.
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