Speaking of Big Craters…

Chicxulub-Anomaly
Gravity anomaly map of the Chicxulub crater. Source: Wikipedia

The Chicxulub crater is a crater buried underneath the Yucatan Peninsula which is suspected to be the location of the impact of the meteor which wiped out the dinosaurs. The crater is more than 180km in diameter and 20km in depth. Estimates place the size of the impacting meteor to be at least 10km in diameter. Although there exists craters that are larger than the Chixculub crater, this particular crater is estimated to have impacted the Earth at a time similar to when the dinosaurs are thought to have roamed the world.

The crater was actually discovered by geophysicists Anotonio Camargo and Glen Penfield, who had originally been looking for petroleum in the late 1970s.  They had originally been unable to obtain evidence that it was an impact crater, but were later able to find gravitational anomalies and shocked quartz which hinted at it being one. The crater now stands as one of the largest pieces of evidence that the dinosaurs were wiped out by a meteor impact.

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