Dental plaque on the teeth of 1,000-year-old skeletons preserved bacteria and food particles.
The bodies were mostly laid side-by-side, while small, empty spaces were fitted with the bodies of children.
It appears the individuals died the same time since there are multiple graves with multiple bodies.
See photos of the excavation of a 4,400-year-old female skeleton that may be the first Windsor queen.
Tiger Cave in Sumatra holds the 3,000-year-old burials.