Mineral alterations of the outer layer of the bones suggest they were entombed in acidic surroundings, such as those found in nearby peat bogs. Exposures to such bogs for a year or so would have mummified them, stopping microbes from decomposing the bodies by essentially tanning them in much the same way that animal skin is turned into leather.
Ancient writings suggest that embalming was practiced in prehistoric Europe, not just in Egypt. For instance, ancient Greek philosopher Poseidonius, writing in about 100 B.C., "visited Gaul and recorded that the Celts there embalmed the heads of their victims in cedar oil and kept them in chests," said researcher Mike Parker-Pearson, an archaeologist at the University of Sheffield in England.
Bizarrely, the man's remains were composed of bones from three different people, possessing the torso and limbs of one man, the skull and neck of another, and the lower jaw from a third, possibly a woman.
The researchers made this discovery of his Frankenstein-like nature by analyzing his skeleton - for instance, evidence of arthritis was seen on the vertebrae of the neck, but not on the rest of the spine, revealing these parts came from different bodies. Also, the lower jaw had all its teeth, whereas those of the upper jaw were entirely missing, and the condition of the lower jaw's teeth revealed they once interacted with a full set of teeth in his upper jaw, showing they originally belonged to another man. [Image Gallery: Scanning Mummies for Disease]