Final answer:
An archaeological site, grave FS 162, contains the remains of at least twenty individuals of varied ages, whose mangled positions suggest a sudden mass burial possibly due to a catastrophic event.
Step-by-step explanation:
The subject matter indicated by the details about grave FS 162 relates to archaeological findings. The description outlines the ages and genders of individuals whose remains were discovered in this mass burial site. The information presented suggests a rapid and perhaps catastrophic event leading to these deaths, as reflected by the 'mangled positions of the bodies'. Such findings are important for understanding the historical context in which these individuals lived and died, offering insights into the past catastrophes or possibly health-related mass deaths. It includes a diverse age group ranging from perinatal or newborn children to adult individuals of indeterminate sex.