Chicxulub impactor Chicxulub impactor The Chicxulub impactor ( ), also known as the K/Pg impactor and (more speculatively) as the Chicxulub asteroid, was an asteroid or other celestial body some in diameter which struck the Earth at the end of the Cretaceous period, approximately 66 million years ago, creating the Chicxulub crater. It impacted a few miles from the present-day town of Chicxulub in Mexico, after which the impactor and its crater are named. Because the estimated date of the object's impact and the Cretaceous–Paleogene boundary (K–Pg boundary) coincide, there is a scientific consensus that its impact was the Cretaceous–Paleogene extinction event
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