T. Rex and the Crater of Doom the Brazos river that a tsunami has swept across the Gulf of Mexico millions of years earlier. The discovery was made thanks to a graduate student named Alan Hildebrand that notified Alvarez of the evidence of a crater on the Yucatan peninsula, which had never been published in the scientific literature by the Mexican petroleum geologists that had found it. The age of the crater needed to be determined if it was going to be a candidate for the KT boundary impact, but access to the region was limited by the crater being buried over time and the core samples
Wilkes Land crater researchers led by Ralph von Frese and Laramie Potts of Ohio State University. The team used gravity measurements by NASA's GRACE satellites to identify a wide mass concentration and noted that this mass anomaly is centered within a larger ring-like structure visible in radar images of the land surface beneath the Antarctic ice cap. This combination suggested to them that the feature may mark the site of a wide impact crater buried beneath the ice and more than 2.5 times larger than the Chicxulub crater. Due to the site's location beneath the Antarctic ice sheet there are no direct samples