Jeffers Petroglyphs Historic Site, east of Jeffers and north of Windom, in southwestern Minnesota, is a small park operated by the Minnesota Historical Society to preserve a large collection of petroglyphs, and a surrounding patch of native and restored prairie.

The outcropping of rock in which the petroglyphs were carved, Sioux quartzite, is part of a 23-mile long ridge in southwestern Minnesota, part of a quartzite deposit that is also featured at Pipestone National Monument in Pipestone, Minnesota.

Based on surrounding ... (more)