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Lunar Crater National Natural Landmark is a volcanic field landmark located 70 miles (110 km) east-northeast of Tonopah in Nye County, in central Nevada. It was designated a National Natural Landmark in 1973.
Volcanic features
A 400-acre (1.6 km2) crater that is thought to have been formed by several volcanic explosions, and is one of two maars in the volcanic field of the Pancake Range.
References
Lunar Crater National Natural Landmark Wikipedia(Text) CC BY-SA