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The pictographs shown above are two components of a rock art complex located near Devil's Lake at the southeast foot of the South Sister Volcano in the Oregon High Cascades. This group of pictographs is found on boulders of obsidian that are located at the southernmost member of a 6 km-long alignment of Holocene rhyodacitic obsidian domes. The pictographs are unique in Oregon because they are found on geologically-recent rocks. The eruption of the volcanic tephra that immediately preceded the extrusion of the obsidian domes has been well dated at about 2,000 14C years (Scott 1987). The unique association of radicarbon dates and obsidian eruptions make these pictographs the most solidly dated of any in Oregon. First described by Luther S. Cressman in 1937 (printed upside down), and later by Loring and Loring (1982), the rock art at this site has been successfully restored after suffering serious spray paint damage by vandals. The now unmarked site is located only a few meters from a major Cascades highway. The line drawing of the pictograph was extracted from an early cultural resource overview conducted for the Deschutes National Forest (Dudley et al. 1979:452).
 
which the lab logo rock art is located. South Sister Volcano is located in the background.
References Cressman, Luther S. 1937. Petroglyphs of Oregon. University of Oregon Monographs, Studies in Anthropology No. 1, Eugene, Oregon. Dudley, James, Rick Bryant, and David Eisler. 1979. Cultural Resource Overview: Deschutes National Forest. Pro-Lysts, Eugene, Oregon. Loring, J. Malcolm and Louise Loring. 1982. Pictographs and Petroglyphs of the Oregon Country, Part I: Columbia River and Northern Oregon. University of California Archaeology Monograph 21, Los Angeles, California. Scott, William E. 1987. Holocene Rhyodacitic Eruptions on the Flanks of South Sister Volcano, Oregon. In The Emplacement of Silicic Domes and Lava Flows, edited by J. H. Fink, pp. 35-53. Geological Society of America Special Paper 212.
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