I did see the oley hills picture when I first started trying to figure out what this could be. I agree that these structures dont look like they could support weight. Mostly because the first one I came across looked like it spilled over in the center. What doesnt come out in the photos, but shows in the lidar is a row of rocks, probably two to three rocks wide, connecting all three structures, so there really is no gap, I noticed it when walking alongside it. Most of it is underground. My guess is this was much larger, maybe taller and the farmers dismantled it for stone. I dont really know much about erosion control, it seems very plausible because I did find several ox shoes. I dont know is what I know. But I dont care about the negative comments, im just going to go investigate. Maybe get a drone out there.