City of Rocks State Park

City of Rocks State Park is a state park of New Mexico, United States, consisting of large sculptured rock formations in the shape of pinnacles or boulders rising as high as 40 feet (12 m). The bedrock forming City of Rocks was created 34.9 million years ago by a volcanic eruption. Then over millions of years, erosion sculpted the rock formations seen today. The eruption was from the Emory Caldera, centered near Hillsboro Peak at the southern end of the Black Range. The eruption was estimated to be a VEI 8 eruption. Also related to the eruption was the 314-square-mile (810 km2) Kneeling Nun Tuff.

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