It could have been the asteroid hit to the Michigan ice sheet that set off the Younger Dryas period. That hit sent enormous ice boulders flying which hit all o

It could have been the asteroid hit to the Michigan ice sheet that set off the Younger Dryas period. That hit sent enormous ice boulders flying which hit all over the U.S. creating the "Carolina bays", and which may also have hit the Atlantic and send huge waves over northeastern Africa.