Chicxulub crater Chicxulub crater The Chicxulub crater (; ) is an impact crater buried underneath the Yucatán Peninsula in Mexico. Its center is located near the town of Chicxulub, after which the crater is named. It was formed by a large asteroid or comet about in diameter, the Chicxulub impactor, striking the Earth. The date of the impact coincides precisely with the Cretaceous–Paleogene boundary (K–Pg boundary), slightly less than 66 million years ago, and a widely accepted theory is that worldwide climate disruption from the event was the cause of the Cretaceous–Paleogene extinction event, a mass extinction in which 75% of plant
Tookoonooka crater Tookoonooka crater Tookoonooka is a large meteorite impact crater (astrobleme) situated in South West Queensland, Australia. It lies deeply buried within Mesozoic sedimentary rocks of the Eromanga Basin and is not visible at the surface. Tookoonooka was discovered using seismic data collected during routine petroleum exploration and first reported in a publication in 1989, with proof of the impact theory coming from the discovery of shocked quartz in drill core. Estimates of the crater diameter range from to . The impact occurred during deposition of the Cretaceous Cadna-owie Formation, the age of which is variously estimated at being between 123–133