Native Americans adorned these caverns with pictographs and petroglyphs. Within the BWCAW are hundreds of prehistoric pictographs and petroglyphs on rock ledges and cliffs. The Ancestral Puebloans also created many petroglyphs and pictographs. Both pictographs and petroglyphs are known as rock art. Ancient petroglyphs, pictographs and mortar holes can be seen in Andreas Canyon. In the Southwestern United States numerous pictographs and petroglyphs were created. California has a large number of pictographs and petroglyphs rock art. In 1977, the park preserved the archaeology of the pictographs and petroglyphs. The use of petroforms, petroglyphs, and pictographs was common throughout the Ojibwe traditional territories. Cuneiform writing began as a system of pictographs. On several cliff faces are hundreds of large red pictographs depicting a large battle. A cave containing several swordfish and cupules pictographs is located here. Students enjoyed Plains art and drawing traditional pictographs on paper and slates. Indigenous accounts were written in pictographs as early as 1525. The Chumash are probably best known for the pictographs.