It is a dirty job, but someone has to do it. What specifically am I referring to? I am referencing the position of understanding the processes of death, specifically how decomposition happens and how that can and does affect bioarchaeological and forensic anthropological interpretations of the dead. This area of study is formally known as taphonomy, and in this blog post you will learn about the stages and processes of decomposition.
The first step of decomposition if the autolysis step. This is when the body undergoes the chemical processes of breaking down the organic tissues. This occurs shortly after death as the body stop maintaining the chemical processes to support life, and it is a naturally occurring aspect of death. This process occurs on a regular timeline if and when no external factors, such as extreme heat or cold, exist. If and when they do they will either speed up or slow down (respectively) the autolysis process and overall decomposition of the organic remains (i.e. the body)
The next step is known as the putrefaction step. This is where, through the breakdown of the body tissues by bacteria, that gases naturally form. This causes the body, particularly the gut region, to expand, leading to a bloated body. This process can also be expedited by heat or hindered by cold. This step often takes place within hours of death.
Eventually the body will contract as these gases dissipate and/or are released from the body, often coinciding with the point where the bodies fluids (e.g. urine and feces) are also naturally expelled. This lack of fluid and gases causes the body’s soft tissues, specifically skin, to recede, creating the illusion of hair and nail growth as the skin shrink and shrivels from its lively form. It was actually this process that reinforced the notions of the deceased and vampirism. This stage is also critical because in the appropriate conditions the body can become mummified or adipocere can occur. Adipocere is when a small amount of moisture comes in contact with the body, creating a wax like texture to the body that is preserved as such. (Note, if you are curious but have a weak stomach do not look it up.)
The final stage of decomposition is the skeletonization stage. This is where all of the soft tissues have decayed away, be it from natural wasting processes, being consumed by scavengers, insects, or bacteria, or otherwise removed through another unnatural process. The hard tissues of the skeleton do not decompose as easily and therefore will remain for far longer than the soft tissues. The bones, however, do not exist indefinitely and will eventually decay away as well. This process is dependent on climatic conditions, with wet and hot climates expediting the decomposition whereas cold and dry climates hamper it. Freezing and warming conditions will also eventually aid in decomposition, particularly if the bones get wet. The freezing and thawing process will break apart the bones, making it easier for them to decompose.
Ultimately, you may be wondering why the study of taphonomy is necessary, and the answer is simple: we must know these processes to understand how to interpret the remains of the deceased. This information can be useful in understanding how long an individual has been dead, how they may have met their end, as well as what may have happened to them after death. Without this understanding one might misinterpret natural decomposition processes as something despicable or overlook evidence of a crime or postmortem (after death) alteration. This is important when investigating criminal cases or archaeological contexts as both inquiries involve a pursuit of accurate interpretation of the evidence to gain more knowledge.
Works Cited
Dupras, T. L., Schultz, J. J., Wheeler, S. M., & Williams, L. J. (2011). Forensic Recovery of Human Remains: Archaeological Approaches, Second Edition. Boca Raton: CRC Press.