Serpent Mound crater

Serpent Mound crater is an eroded meteorite impact crater in southern Ohio, lying mostly in Adams County and extending into Highland and Pike counties. Geologists identify it as a complex crater with a central uplift, transition zone, and ring graben. Erosion has softened the landform, but estimates place its original rim at about 8 kilometers across, with a 2010 study suggesting as much as 14 kilometers. The crater is less than 320 million years old and takes its name from Serpent Mound, the effigy mound within it. Its unusual terrain has long drawn attention, and in 1980 it was designated a National Natural Landmark.

Peebles, Ohio · United States