You can find the answer to that question or be given the name of someone that can help you if you call the Heritage Museum in Twin Falls. There was a man around twin for many years , I beleive his name was Robert Woods, he taught classes on Indian Artifacts and flint knapping and Twin Falls has several of these old timers that really know these tools. The Heritage museum also has the most valuable stone tool collection that has ever been found, it is called the Simon Collection. The Simon collection was unearthed in or around 1969 and I believe there were 29 spear points and tools found together on the Camas Prairie in Idaho. They are absolutely beautiful and they have know idea where all the different spear points came from. They do know they were used for killing Saber Tooth Tigers and Wooly Mammoths around Fairfield Idaho by Cave Men.