SMOKING GUN FOR PERMIAN MASS EXTINCTION DISCOVERED?
"Together, these features demonstrate that the "Cameroon impact" occurred prior to the fragmentation of Pangaea and that Pangaea fractured along fault lines generated by this same impact. Once one
accepts that Earth's structural geology retains a record of very large
ancient impacts, the same impact model reveals a previously unrecognized
power source for plate tectonic motions."
http://abob.libs.uga.edu/bobk/ccc/cc040902.html