Our sister organization, Brule River Preservation LLC, has been sponsoring a very interesting research project where University of Minnesota scientists are documenting the fire history of the Upper Brule Valley. At their annual meeting in May, an early summary of the results was presented to the membership. The researchers take bore samples of the trees where they can see fire scars left on the tree rings. The earliest fire that has been documented thus far is from the year 1576. You can read about this on their website by clicking on Fire Study.