What is the term for a fossil that preserves the actual body part?

What is the term for a fossil that preserves the actual body part? The term is body fossil.

A body fossil is preserved material from an organism’s physical body, such as a bone, tooth, shell, leaf, wood fragment, or exoskeleton. It may retain its original substance, or the material may be altered, replaced, or filled with minerals during fossilization. Most body fossils represent only part of an organism because soft tissues usually decay before burial and preservation.

This term contrasts with a trace fossil, which records an organism’s activity rather than its body. Footprints, burrows, nests, feeding marks, and coprolites are examples of trace fossils. A mold is an impression left in sediment, while a cast forms when that impression is later filled with minerals or sediment; neither term specifically means preserved body material.

Exceptional fossil sites called Lagerstätten can preserve soft tissues, body outlines, and other delicate details. Even then, “body fossil” describes what has been preserved, not necessarily material that remains chemically unchanged from the living organism.