Osteologist, Don Walker, explains what archaeologists can learn from the bones found is a mass grave: http://www.gresham.ac.uk/lectures-and-events/mass-burials-from-st-mary-spital-london

The excavation of St Mary Spital in East London uncovered a large number of emergency mass burial pits. Dating places the burials in the mid-13th century and may provide the first archaeological evidence of a global catastrophic volcanic event.
Part of the Mondays at One Archaeology Series.

The transcript and downloadable versions of the lecture are available from the Gresham College website: http://www.gresham.ac.uk/lectures-and-events/mass-burials-from-st-mary-spital-london
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