Castle Gardens, Wyoming.
"Italian chariot wheel coin design and supposed imitation
at CastleGardens. Barry Fell, Saga America, p.152.
I believe that the image of the supposed imitation "Italian chariot wheel coin" corresponds to the shield figure found in the illustrations below. According to James Keyser this image is not even from Castle Gardens, Wyoming. He identified it as being found near Sheriden, Wyoming. Although a little hard to make out in the actual photo you can identify the form of the shield easily in the drawing that I made from an illustration in James Keyser and Keyser and Michael A. Klassen's 2001 book, Plains Indian Rock Art.
Shield figures, Wyoming. The shield of
the figure on the right corresponds to Fell's "H" above.
Castle Gardens translation, Barry Fell,