But we haven't witnessed a big asteroid impact, so this is a type of neo-catastrophism, and it took about 20 years for the scientific establishment to finally come to grips: yes, we were hit; and yes, the effects of that hit caused a major mass extinction.
Men vi har ikke oplevet en stor asteroide-kollision, så dette er en slags "neo-katastrophism", og det tog omkring 20 år for den  videnskabelige establishment at fatte: Ja, vi blev ramt; og ja, virkningerne af dette hit forårsagede en større masseudslettelse.