Beaverhead crater

Beaverhead is an impact structure in central Idaho and western Montana in the United States. Estimated at 60 kilometers (37 mi) in diameter, it is one of the largest impact craters on Earth. Its age is estimated to be about 600 million years (late Neoproterozoic).

The structure is named after the area in southwest Montana where evidence of an impact was first discovered in 1990. Other than the original shatter cones found on the perimeter, there is little visible evidence of the structure.