I messed with the picture and then made a negative and a closeup (below). I think it enhances the details. Please pass it along.
From Russel: http://www.oregonrockart.com
From Wayne May: yes, do it. wayne
Jim Leslie wrote:
From David Grant Stewart, Sr.
Look a bit like Mayan or Olmec hieroglyphs, but not enough resolution to say anything definite.