The first stone construction I was ever felt was with-out-a-doubt Native American in origin was the above quartzite stone bear's head ( http://wakinguponturtleisland.blogspot.com/2007/06/old-friend.html & seen here in action: http://wakinguponturtleisland.blogspot.com/2009/04/bear-stone-rocking.html), so my first impression of this photo I saw this morning at Rock Piles was, "There's a bear on that Stone Row!"
A "construction in this otherwise entirely ordinary wall..."
Original Chris Pittman photos from:
And here's a Turtle Vision after a closer look:
And there's the Bear's Eye outlined above too because sometimes a stone can be both a bear and a turtle: