Bradbury Brook is an archeological procurement area (21ML42), located a few miles south of Mille Lacs Lake in east central Minnesota. Here Late Paleoindian inhabitants gathered cobbles of siltstone from a streambed or directly from glacial drift. A partially intact stone workshop at this site was dated to 7212 +/- 75 BCE (before common era). The siltstone was used to produce a variety of tools, including a stemmed point, other bifaces, keeled scrapers, blades and chipped stone adzes. The workshop also contained several fragmented anvilstones and an abundant sample of hammerstones of various sizes
Archaeologists working at the site found more than 125,000 artifacts, including stone tools, dating to 7212 BCE, making it the earliest dated excavated site in Minnesota.