Obsidian does not naturally occur in Alberta where the artifacts are being unearthed at Early Prehistoric archaeological ...

Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast prehistoric trade networks that once cut across western North America.

Now, researchers may have answered how these artifacts made of obsidian ended up so far away from their point of origin ... including arrowheads and spear tips, traveled nearly 750 miles from ...