trace fossil

a fossilized track, trail, burrow, boring, or other structure in sedimentary rock that records the presence or behavior of the organism that made it. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trace fossil
the fossilized remains of a track, trail, footprint, burrow, etc, of an organism

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
trace fossil  
A fossil consisting of an imprint of or a mark left by an organism, as opposed to physical remains. Trace fossils are produced in soft sediments and include surface tracks, molded impressions left by organisms or tissues that later decayed, and subsurface burrows or tunnelings.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The best known trace fossil are tracks but burrows, nests, and gnaw marks on bones or plants are also types of trace fossils.
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