Some 12,000 years ago, North American mammoths, ancient horses, and many other large mammals vanished within the short span of perhaps 400 years.
Scientists cannot be sure what killed them, but a new study suggests that humans aren't off the hook just yet.
. . .
Now a new study of the fossil record fuels the debate about the cause of the creatures' fate.
It's a statistical reevaluation of the terminal dates for a particular species of horse, not any new dates on specific specimens. Probably won't change many minds. Must wait for any critiques of the paper itself.