The Dinosaur Age May Have Ended in Springtime The New York TimesThe asteroid that doomed the dinosaurs struck in springtime CNNAn asteroid killed dinosaurs in spring—which might explain why mammals survived Ars Technica'Frozen in place' fossils reveal dinosaur-killing asteroid struck in spring Livescience.comSpringtime asteroid hit ramped up extinction rates, say scientists The GuardianView Full Coverage on Google News