The Black Mountain Rock Art District is an archaeological district located in the Mojave Desert northwest of Barstow, San Bernardino County, California. The district includes a large collection of Native American rock art, including over 12,000 petroglyphs. The largest group of petroglyphs, which includes over 1,000 of the designs, is in Inscription Canyon. The more complex designs include humanoid figures, shields, masks, baskets, deer, bighorn sheep, and other plants and animals. Other petroglyphs represent patters such as cirles, lines, and zigzags. Native Americans made petroglyps in the area due to its abundance of easily marked lava rock and hard quartz for making etching tools.