A biface is one of humankind's first tools, made by shaping a stone into a point, with one rounded ... that's shaped to create a dagger or arrowhead. An obsidian preform—a flake off a larger ...

Obsidian, a naturally occurring glass formed when lava cools rapidly, is the material of choice for making arrowheads. From a large piece of obsidian, you have to break off a smaller section to ...

One point was more than 17 inches long and 6 ... who gathered much of their stone for tools from Obsidian Cliff, still wear red obsidian arrowheads “for spiritual protection,” said Timothy ...

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 ...

At Tomales Bay State Park on the Point Reyes Peninsula, perfectly crafted arrowheads have been found on trails, obsidian black and 1-to-2 inches long, with crafted serrated edges. At Garin ...

It may look like a chunk of obsidian to most people. But Steve Gobel sees the arrowhead waiting to be freed. Whether he can depends on how he hits the obsidian, cuts it and shapes it. The Twin ...

After closer inspection, he realized it was an obsidian arrowhead, formed from cooled molten lava. “I think every one of us likes to think we’re a little bit of Indiana Jones, and this was my ...

Jamie Hale/The Oregonian Obsidian is a dark, natural glass, formed when lava cools without crystallizing. Humans have used it for pottery, arrowheads and even surgical scalpels. It's not exactly ...