The find includes dozens of craters spread across southeast Wyoming.
In addition to 31 craters the scientists have firmly identified as secondary features, the team spotted more than 60 other contenders. had broken up in mid-air and sent rocks crashing into the ground beneath its path. Individual craters range between 32 and 230 feet in diameter, the researchers said.
Further examination showed that several of the craters are clustered in small areas and several are elliptical, rather than circular, which suggested a different origin story for the features.
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