With a variety of quality rock and mineral types represented in the cache—this point is made of obsidian—it is clear that its owner either traveled far to procure specific types of stone or ...

Blade cores provided a portable source of stone or obsidian for manufacturing different kinds of tools by flaking off pieces from the core. The basis of many Upper Paleolithic tool forms from both ...

Over about 11,500 years, the stone has been fashioned into deadly knives, razor-sharp spear points, arrowheads and darts for atlatls, or spear-throwers. The obsidian columns of Yellowstone have ...