News – Sheridan Media {“value”:” In 1964, Geroge C. Frison, Wyoming archaeologist, excavated The Piney Creek Bison Jump north of Lake DeSmet. The site was radiocarbon dated at A.D. 1580 to A.C. 1610. On Thursday, November 21, at 2 p.m. the Clearmont Historical Center will host a talk by Dave Nicolarsen, Museum Curator at Sheridan