I read 3 of Velikovsky’s books 30 years ago. I didn’t believe his Venus/Jupiter theory, but the masses of tumbled bones in Canada and flash frozen Mammoths in Siberia made me believe that something serious happened. Then you posted that book by Firestone, et al, and it all made sense. Please post again for others.
Thank You for this ping. It (all) was an interesting read.
Immanuel Velikovsky and his Worlds in Collision,
50 years after
http://itis.volta.alessandria.it/episteme/ep4/ep4sped1.htm