Sore feet

We did a very long loop hike today that links 2 areas of petrified wood. We hiked for several hours though 'short grass Prairie', that was new experience for both of us. Rolling grass covered hills for as far as you could see. The bison were up there with us. The trails are marked by 4X4 posts set in such a way that you can see the next one when passing the previous one. The only problem with that system is that the bison knocked over 1/3 of the posts so we weren't always sure where we were. Tomorrow we move to where poor General Armstrong Custer made his Last stand.