All alien archeologists will find on our planet is the KPg layer marking the asteroid impact that wiped out the dinosaurs … and another thin layer of radioactive rock and soil evenly dispersed across the planet that marked the end of our period on the planet.
All alien archeologists will find on our planet is the KPg layer marking the asteroid impact that wiped out the dinosaurs … and another thin layer of radioactive rock and soil evenly dispersed across the planet that marked the end of our period on the planet.