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
Cloud Creek crater skirt, and four through the outer rim structure. Cloud Creek crater Cloud Creek crater is an impact crater in Wyoming, United States. The crater is located in Natrona County, about 48 miles northwest of Casper, near the center of a geological feature known as the Casper Arch. The Cloud Creek structure is circular with a current diameter of about 7 km, and it is buried beneath about 1200 m of Mesozoic rocks. The age of the structure is estimated to be 190 ± 20 million years, which means that it formed as the result of an impact during the early