http://www.sarti.us/sarti/files/SearchForHumanRemains.pdf
The change from pre to post-skeletonization has several key hallmarks, each with a
variety of factors influencing onset. This would include, but is not limited to,
temperature, moisture, predation, and presence of trauma.
Among the many factors influencing decomposition is whether or not the body is above
or below ground. In general, bodies above ground decompose more quickly than those
below ground. The slower rate of below-ground decomposition is due largely to
decreasing gaseous diffusion. This limits micro and macro-organisms. The overall effect
is that carbon dioxide is increased, resulting in anaerobic conditions.
Total disarticulation with only cranium and other assorted skeletal elements or fragments recovered. (5 to 52 months)