I'd like to know more about the rest of the skeletons and what happened to them. Bone marrow, for instance, might tell its own story.
The acount reads:
"Beside it, sticking up out of the ground, was a malformed skeletal hand entwined in one of the human skeleton's upper arms."
When a corpse reaches its final stage of decomposition, usually the bones part company from each other. Looking at the account above, the hand of the child must have been tightly gripping the mother's arm? Yet bones usually part company as I say above...so there may have been some kind of mummification in the dry atmosphere. So, was the child buried at the same time? A disturbing picture emerges - and surely the child's hand was gripping or being entwined with, the mother's arm or wrist...not the mother gripping the child's hand.
It would also be interesting to go back to the original site where the discovery was made.