Ichnofossils or trace fossils, are marks left in the sedimentary record by living organism but are n

Ichnofossilsortrace fossils, are marks left in the sedimentary record by living organism but are not a body part of the organism. For example, pictured are burrows left by an organism that was feeding on an organic matter in the sediment. These provide an evidence of ancient organism activity after sediment deposition but before it turned into hard rock.

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