The fossil type you are describing is known as a trace fossil. Specifically, if the body of the animal sinks into mud that later hardens and turns into rock, the fossil could also be classified as a body fossil if it preserves the organism itself. If the focus is on the evidence of the organism's activity, such as footprints or burrows, then it would be categorized as a trace fossil. However, if it is the actual remains that become fossilized, it would be termed a body fossil.
Definition:when the body of the animal sinks into mud which later becomes rock
fossil type:blank
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