File:Scatter of obsidian flakes at a prehistoric quarry south of Riley, Oregon (USA) (1287120636).jpg
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![File:Scatter of obsidian flakes at a prehistoric quarry south of Riley, Oregon (USA) (1287120636).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Scatter_of_obsidian_flakes_at_a_prehistoric_quarry_south_of_Riley%2C_Oregon_%28USA%29_%281287120636%29.jpg/800px-Scatter_of_obsidian_flakes_at_a_prehistoric_quarry_south_of_Riley%2C_Oregon_%28USA%29_%281287120636%29.jpg?20170620035715)
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