The discovery of obsidian at a prehistoric site probably indicates:

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Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is often found far from its volcanic source, indicating its movement through trade networks. Prehistoric peoples valued obsidian for its sharp edges, using it to make tools and weapons. The discovery of obsidian at a site, especially if the nearest source is hundreds of miles away, suggests the existence of long-distance trade networks rather than local volcanic activity, lightning strikes, or experimentation with fire.

The Discovery of Obsidian at a Prehistoric Site Probably Indicates