I invented a new term--paleotornadoes--in case a scientist figures out how to study tornadoes that occurred before recorded history.
I hypothesize that tornado frequency and intensity was more severe during some climatic stages of the Pleistocene, and I think there was an Ice Age tornado alley in the middle south because this region was a transition zone between the Laurentide Ice Sheet and the warmer than present day temperatures of the Gulf of Mexico.https://markgelbart.wordpress.com/2017/ ... w-ecology/
There was an episode of What on Earth? on the Science Channel that showed a satellite photo of a long cleared path in a Wisconsin forest. It looked manmade because it was so straight. People went to investigate and determined it was made by a tornado. They traced it back to a tornado that hit the area in 2008.
Windthrows are fascinating.