A body fossil preserves evidence of an organism's body or a part of it, such as a tooth, bone, shell or leaf. Preservation can retain original material, a mineralized structure, an impression or a cast. A body fossil therefore need not be an intact body or contain the original organic substances.
A trace fossil, such as a footprint or burrow, records activity rather than the body itself. Both are biological evidence, but they answer different questions: a tooth can constrain anatomy, whereas a trackway can constrain movement. Decay experiments show why preserved anatomy requires care: some characters disappear before others, biasing the apparent similarities used in phylogenetics.[ref]
Non-random decay of chordate characters causes bias in fossil interpretation by Robert S. Sansom and others. Experimental character-loss sequences and their consequences for fossil reconstruction
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