Is it suggested that they all died at once? Or that this was the place (as elephants are said to have a place) where they went to die?
Researchers believe the mammoths at the Waco site, which include the fossilized remains of the largest known nursery herd of females and juveniles in North America (the only bigger herd was found in Siberia) and several smaller groups, died in a series of floods spread over thousands of years
It also suggest they may have drowned upstream and washed down into a pile.
I’m guessing they did have their own elephant *graveyard*