For 10 points, name this event which occurred around 65 million years ago and is thought to have been caused by an asteroid impact.
A commonly accepted hypothesis regarding this event is the Alvarez hypothesis. Another hypothesis is that it was caused by the formation of the Deccan Traps. Evidence of this event is found at the K-T boundary, and this event marks the end of the Mesozoic Era. For 10 points, name this event which occurred around 65 million years ago and is thought to have been caused by an asteroid impact.
A commonly accepted hypothesis regarding this event is the Alvarez hypothesis.
{extinction} of the {dinosaurs} [or {Cretaceous}-{Tertiary extinction} event; or K-T {extinction}