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Prehistoric horse bone F3908
A burrow is a trace fossil that is created by the burrowing activities of an organism. Often it has an elongated form, which may be branched, but there are also burrows with more complex forms. Sometimes the inner walls of a burrow have been lined with a specific material by the organism, such as faeces or prey remains. Also, there are burrows with traces of the burrowing activity itself (e.g. claw traces of reptiles).
For more information, also see Ichnofossils.
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