A discussion of a specific group of rock cairns in the Missouri Ozarks, first documented in 2004. The purpose is to seek data and clues to the origin of the builders, their purpose, and the probable dates of use. As of Feb 2012, 27 cairns have been identified, ranging in volume from about 0.8 to 16 cubic meters.
Below is a link to images of selected cairns. Many include a survey rod, which when fully extended is eight feet long.
Use the Picasa SLIDESHOW button to auto-display all images, or click each thumbnail pic for selected viewing.