Obsidian cutting tools
I read an interesting article in the New York Times that discussed the obsidian outcrops in Yellowstone National Park, and how they were mined for hundreds to thousands of years to supply the cutting...
A Guide to the Earth for the Layperson
I read an interesting article in the New York Times that discussed the obsidian outcrops in Yellowstone National Park, and how they were mined for hundreds to thousands of years to supply the cutting...