Silver Mound in Hixton, Wisconsin, was one of the Midwest’s most important prehistoric quarry sources because its silicated quartzite could be shaped into tools such as projectile points, knives, and scrapers. Human use began by about 9550 BC, and tools made from its stone date to around 11,000 years ago, providing key evidence for the earliest known people in Wisconsin. Stone from the mound traveled widely, reaching places as distant as Mammoth Cave in Kentucky. Archaic, Woodland, and Oneota peoples also used the quarry, where archaeologists have found about one thousand pits, workshop areas, rock shelters, and rock art.