You sometimes see a drystone wall that has a mortared top. Here's one example: https://www.google.co.uk/maps/@51.8862561,-2.0573352,3a,24.1y,242.19h,83.72t/dat

You sometimes see a drystone wall that has a mortared top. Here's one example: https://www.google.co.uk/maps/@51.8862561,-2.0573352,3a,24.1y,242.19h,83.72t/data=!3m5!1e1!3m3!1s8cyXu5hSVCJuB3S4MQO32Q!2e0!6s%2F%2Fgeo2.ggpht.com%2Fcbk%3Fpanoid%3D8cyXu5hSVCJuB3S4MQO32Q%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D173.7214%26pitch%3D0%26thumbfov%3D100 https://www.google.co.uk/maps/@51.8862561,-2.0573352,3a,24.1... Just down the road there's another, less attractive, example: https://www.google.co.uk/maps/@51.885003,-2.0568722,3a,46.6y,104.31h,77.07t/data=!3m6!1e1!3m4!1sh8frKx8azhN7IXR6G6KZEA!2e0!7i13312!8i6656 https://www.google.co.uk/maps/@51.885003,-2.0568722,3a,46.6y...