Obsidian Cliff: Humanity’s Tool Shed for the Last 11,500 Years

Jim Robbins Science your-feed-science, Archaeology and Anthropology, Historic Buildings and Sites, National Parks, Monuments and Seashores, Rock and Stone, Volcanoes, Native Americans, Tools, British Museum, Peabody Museum, Yellowstone National Park X-ray technology has allowed researchers a glimpse at the reaches of the Yellowstone landmark’s prized stone and its importance to Indigenous people. https://ift.tt/84CiZh2