This specimen, discovered on private land in Harding County, South Dakota in 1981 by Michael Zimmerschied, and Dee Zimmerschied and on 4 October 1992 (Alan and Robert Detrich re-discovered Samson after it was originally found and deemed by paleontologist's that several bones had washed in and there was nothing left).
Discovery Mike Zimmerschied, with father Dee Zimmerschied, discovered Samson in 1987 on their ranch just south of Buffalo, South Dakota.