Burke County for 52 years and have never seen the Oneil ranch. It's not Lostwood, and I'm well aware of what is unbroken sod and what is not
Of course it's in the Missouri coteau, which runs from southern Sask all the way down through SD. While the coteau grasslands still exist in Burke County, most of it is gone in the remainder of the coteau, some large chunks of it disappeared in the last 20-30 years, some of that for ethanol, and it is every bit as rugged as Burke County, where landowners have chosen ranching over subsidized farming
I did turn the butz and oil boom eras upside down, much like most of the coteau.