Natural Bridge State Park (Wisconsin)

An archaeological excavation of the rock shelter was conducted in 1957 by Warren L. Wittry of the Wisconsin Historical Society. His team found evidence of human use over a long time period. The remains of 50 vertebrateand 15 mollusc species were identified. The oldest artifacts were pieces of charred wood, presumably from fire pits, which were dated to between 9000 and 8000 BCE. This would make it the oldest documented site of human occupation in the upper Midwest.^[2] There were also artifacts such as antler-scrapers dating back to six to seven thousand years ago. Evidence indicates that the shelter was used only periodically at first, perhaps as a hunting or seasonal camp. Later it was inhabited year-round.

• http://en.wikipedia.org/wiki/Natural Bridge State Park (Wisconsin)
• http://www.wisconsinhistory.org/Content.aspx?dsNav=N:4294963828-4294955414&dsRecordDetails=R:IM36901