The Glasford crater, also known as the Glasford Disturbance, Glasford Structure, and Glasford Cryptoexplosion Structure, is a buried impact crater in southern Peoria County, Illinois, in the United States. It is one of two known meteor craters in Illinois.
It is in diameter and the age is estimated to be less than 430 million years (Silurian or younger). It was formed in a marine environment in the Late Ordovician period. The meteorite is estimated between 50 and 90 million tons and likely originated in the asteroid belt between Mars and Jupiter.
The Glasford crater was discovered by the Central Illinois Light Company (formerly CILCO, now Ameren) while drilling wells for underground natural gas storage. It is not visible from the surface, as it is covered by agricultural farmland. In the 1980s, scientists identified shatter cones. Dr. Birger Schmitz's study suggests that the dust from the meteor impact may have impacted Earth's climate and contributed to the mid-Ordovician Ice Age.