This gallery consists of different petroglyphs of Martis Culture which occupied Donner Summit in summers from about 2,000 B.C. to 500 A.D. Petroglyphs are found in many places and all are of the same style with repeated designs. No one knows their significance. Perhaps they had religious or mystical meaning. Perhaps they were hopes for the future or perhaps they were records of the past. Whatever the case they mush have had great significance because granite, onto which they are carved, is one of hardest rocks on the planet and the petroglyphs must have taken a lot of time and energy to create.
Some links regarding petroglyphs
petroglyph page on this site
20 Mile Museum sign for the petrglyphs (and a sign not installed)
20 Mile Museum sign for Native American mortars (look also at the brochure page for the Summit Valley brochure.)
Brochure page - choose the Native Americans of Donner Summit brochure.
See two book reviews with lots of good information: The Martis and Ancient Rock Carvings.
Look at the Heirloom editions June '15 and August '15 for articles about Wabena Cr. petroglyphs and petroglyphs below Castl Pk.