- $7 adults
- $6 seniors and college students
- $5 children ages 6-17
- Free for children age 5 and under and MNHS members.
Petroglyphs are images carved on a rock face. The word comes from the Greek "petra" meaning stone and "glyphe," meaning carving. Petroglyphs are found worldwide.
Careful study and interpretation of the carvings at Jeffers had identified approximately 2,000 individual petroglyphs on a part of the rock face 50 yards wide and 300 yards long. Adjoining rock was covered with lichen, an organism that is part alga, which needs sunlight to make food, and a fungus that anchors itself to the rock.
Beginning in 2006, a plan was made that would naturally remove the lichen with the least impact on the petroglyphs that might be underneath. The effort took more than five summer seasons and included covering the lichen with sun-blocking black plastic membranes, removing their source food via sunlight, and removing dead lichens with careful and repetitive mopping.
The outcome? The number of identified carvings at Jeffers Petrglyphs more than doubled, from 2,000 to 5,000.
A research team is assembled at Jeffers Petroglyphs and is charged with gathering together to further the understanding of the people who interacted with the carvings, their history and culture, and the meanings of the carvings. Members are made up of Dakota, Arapahoe and Cheyenne elders, state and university archaeologists, and conservationists.
Rock Ridge Prairie by the DNR