Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast ...

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

Some of the obsidian artifacts, including arrowheads and spear tips ... According to the study, a large portion of the obsidian deposits were uncovered at bison jumps — areas where indigenous ...