We headed over and found what John later described as the "Mason-Dixon" line for the Kansas and Nebraska Territories. It marks the 40th parallel, which was surveyed when the territories came into being. After reading The True Adventures of Lidie Newton by Jane Smiley this winter, I know a bit more about the conflicts between slave holders and abolitionists in Kansas territory prior to the Civil War. Here I am, talking to Jenny on the phone, letting her know we did find the large rock that marks the spot. So glad I brought my phone along as this was, indeed, an interesting spot.