The petroglyphs, called “one of the most awe-inspiring and intriguing things to see” by Eastern Sierra, are located in the Volcanic Tableland near Bishop, California, about 80 miles east of Fresno.

The petroglyphs can be found on volcanic tuff formations formed over 760,000 years ago when a large eruption released hot ash that settled over the region. The Paiute-Shoshone Indians later chipped away at the red pumice stone, which exposed the lighter rock minerals underneath, according to the Bureau of Land Management.

The damage to the stone carvings, some of which date back 7,000 years, was discovered at three separate sites at the Volcanic Tableland, north of Bishop.

The Bureau of Land Management is offering a $1,500 reward for information leading to the vandals who desecrated ancient Native American petroglyphs in California. The protected rock carvings at Volcanic Tableland near Bishop were created by the Paiute-Shoshone tribe before European settlers came to the area,