A structure formed in a sediment by the action of a living organism (e.g. a tube, burrow, footprint, or groove made by crawling across a surface) and preserved when the sediment becomes a sedimentary rock. Traces are most commonly found at the interfaces between different rock types (e.g. between sandstone and shale) and are classified in various ways, including their forms and the places of their occurrence.
Subjects: Zoology and Animal Sciences.