Highlight text to annotate itX
All About Chicxulub crater
The Chicxulub crater is a prehistoric impact crater buried underneath the Yucat�n Peninsula in Mexico
Its center is located near the town of Chicxulub, after which the crater is named
The age of the Chicxulub asteroid impact and the Cretaceous�Paleogene boundary (K�Pg boundary) coincide precisely
The crater is more than in diameter and in depth, making the feature one of the largest confirmed impact structures on Earth; the impacting bolide that formed the crater was at least 10 km (6 mi) in diameter.
The crater was discovered by Antonio Camargo and Glen Penfield, geophysicists who had been looking for petroleum in the Yucat�n during the late 1970s
Penfield was initially unable to obtain evidence that the geological feature was a crater, and gave up his search
Through contact with Alan Hildebrand, Penfield obtained samples that suggested it was an impact feature
Evidence for the impact origin of the crater includes shocked quartz, a gravity anomaly, and tektites in surrounding areas.
The age of the rocks marked by the impact shows that this impact structure dates from roughly 66 million years ago, the end of the Cretaceous period, and the start of the Paleogene period
It coincides with the K-Pg boundary, the geological boundary between the Cretaceous and Paleogene
The impact associated with the crater is thus implicated in the Cretaceous�Paleogene extinction event, including the worldwide extinction of non-avian dinosaurs
This conclusion has been the source of controversy
In March 2010, 41 experts from many countries reviewed the available evidence: 20 years' worth of data spanning a variety of fields
They concluded that the impact at Chicxulub triggered the mass extinctions at the K�Pg boundary.