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The Jeffers Petroglyphs in southwestern Minnesota is a site where thousands of symbols, glyphs, and figures were carved into the very hard, glacier marked Sioux quartzite that comes to the surface here. The glyphs at this sacred Native site could date as early as 7000–9000 years ago up to a couple centuries ago. Surrounding the exposed rock face is a prairie remnant, giving but a small sense of what the landscape in the area was once like before European settlement. The site is owned and operated by the Minnesota Historical Society. The prairie landscape and flower photographs start at photo 16.