One explanation for this event is supported by the Deccan Traps.
One explanation for this event is supported by the Deccan Traps. Evidence from Hell Creek, Montana appears to support both prevalent hypotheses. The most widely-known explanation for this event was first hypothesized after the discovery of an unusually iridium-rich layer in the Earth's crust, and was further supported with the discovery of the Chicxulub ("CHICK-shu-loob") crater off the coast of the Yucatan Peninsula. For 10 points, a sudden increase in volcanic eruptions or impact with an asteroid are the two currently competing theories that explain what event that happened about sixty-five million years ago?
One explanation for this event is supported by the Deccan Traps.
{extinction} of the dinosaurs [or K-T {extinction}; or equivalents]