Ancient footprints in New Mexico reveal new evidence of Ice Age humans that walked

[wnylib]

4. How could they trace the origin of

ancient fossil footprints and their pathway to South America? I could see in the White Sands footprints some characteristics of Native American foot shapes (I have some of them myself, courtesy of grandma), but would not be able to trace an origin across the globe just from the footprints.

The Campanian eruption lowered global temperatures by 2 to 3 degrees Fahrenheit for about 3 years, AFAIK. The greater problem was acid rain and sulphur and chloride that was dispersed, affecting the entire globe, but especially areas closest to the eruption (southeastern Europe) and along the path of the volcanic cloud into central Russia, north and just a little east of the Caspian Sea.

Homo sapiens survived, so the eruption would not have been the only factor in the demise of Neanderthals and Denisovans, would it?