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Reference.org
Skolithos
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<p><i>Skolithos</i> (formerly spelled <i>Scolithus</i> or <i>Skolithus</i>) is a common <a href="/facts/Trace_fossil/kaucgzNj">trace fossil</a> <a href="/facts/Ichnogenus/edWeWT20">ichnogenus</a> that is, or was originally, an approximately vertical cylindrical burrow with a distinct lining. It was produced globally by a variety of organisms, mostly in shallow marine environments, and appears as linear features in sedimentary rocks. </p>