Top 5 and Top 10 Prehistoric Obsidian Source Lists
We've started compiling state-by-state lists of top 10 or top 5 obsidian sources for most of the western United States and will be adding states here on a regular basis. Please note that these are casual compilations based on thorough queries of the laboratory database and are subject to all kinds of biases. In Oregon, for example, the majority of provenance studies have been carried out in the western half of the state and eastern sources are bound to be underrepresented. Large projects associated with gas pipelines or power transmission line corridors will also add plenty of bias to the results. That said, these lists should provide a overall sense of the major obsidian sources that were used by the prehistoric inhabitants of each state.