The right answer is body fossil sediment.
Fossils are traces of life which can be both animal and plant. They are studied by paleontologists or geologists.
Fossils are often formed by mineralization. Over time, the tissues of the dead body are gradually replaced by minerals. In rare cases, organic matter can be preserved, especially when the body is kept in the cold (for example within the permafrost), in bitumen (case of mummification) or in resin (as in the yellow amber).