There were some steep hills, I don't remember any cliffs... but there's a lot of landslide scars on many of the hills, so maybe they fell apart?

We were mainly looking for remains of the   (You need to Login or Register that was found a few years ago in the Cretaceous Pierre shales exposed in the Pembina Gorge, but our luck was not that great. And certainly not as great as the "Dakota" hadrosaur that was found out in the western Badlands, which had partially intact   (You need to Login or Register

But, at least we had a good time on the river...