An eroded impact crater on Earth, identifiable by its geological structure and highly shocked rocks; the name means ‘star wound’. About 190 terrestrial impact structures are known. Evidence of an impact origin includes signs of high-pressure shock waves, such as shatter cones, shock-induced minerals (e.g. coesite and stishovite), and microscopic linear patterns in quartz called shock lamellae. The largest are Vredefort in South Africa (diameter 160 km), Chicxulub in Mexico (150 km), Sudbury in Ontario, Canada (130 km), Popigai in Russia (90 km), and Manicouagan in Quebec, Canada (85 km). Virtually all are on land, but Montagnais (diameter 45 km) is on the continental shelf off Nova Scotia, and Chicxulub extends into the Gulf of Mexico from the Yucatán Peninsula. The oldest, Suavjärvi (in Russia) and Vredefort, are just over 2 billion years old, but the majority (about 60%) are less than 250 Myr old.

http://www.passc.net/EarthImpactDatabase/index.html Database of terrestrial impact structures.