Mark Burkhartsmeyer poses above two initials, "K P," atop a small hill on his family's ranch south of Chinook. It's believed sheepherders used glacial erraticas (random rocks carried and dropped by glaciers) to do rock writings. Some sheepherder markers were likely used to indicate trails, boundaries or water sources, while others, like these initials, were likely built as a distraction from a lonely job.