File:Prehistoric obsidian quarry south of Riley, Oregon (USA), 1966 (997940721).jpg
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![File:Prehistoric obsidian quarry south of Riley, Oregon (USA), 1966 (997940721).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/95/Prehistoric_obsidian_quarry_south_of_Riley%2C_Oregon_%28USA%29%2C_1966_%28997940721%29.jpg/800px-Prehistoric_obsidian_quarry_south_of_Riley%2C_Oregon_%28USA%29%2C_1966_%28997940721%29.jpg?20170620035720)
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