My attention was caught by a photo of Hueco Tanks by Victor Calzada in a December 30, 2004 article by Diana Washington Valdez in the El Paso Times news online at
As I have often noted, rock art drawings are generally not as old as the sculpted stones at those same rock art sites, upon which or near which the rock drawings are made by later generations, and from which the rock drawing motifs originate. These sacred sites are generally extremely old.
I have uploaded a section of the photo in question together with my interpretation of it
to our North America folder at the LexiLine Files at http://groups.yahoo.com/group/LexiLine/files as huecotanks.jpg [the graphic below]
As you can see there, Hueco Tanks in my opinion marks the stars of Serpens Caput at the Autumn Equinox ca. 3117 BC, an interpretation which fits my previous decipherment of other sites in the USA as marking an ancient survey of America by astronomy. Serpens Caput was as yet missing from this astronomical picture, but fits in perfectly with the astronomy of the other sites that I have deciphered.
Also identified at Hueco Tanks appears to be Ophiuchus as a man's head - a frequent representation of Ophiuchus on ancient sites. The carving is unmistakeable. Next to the human head is a serpent's carved head, clearly seen when magnified, marking Serpens Caput. To the left of Ophiuchus is a strange diamond-shaped rock which would seem totally out of place as a natural phenomenon, marking the diamond-shape of Aquila next to Ophiuchus. This must have been carved into that shape. I am unable to identify the figure marking Hercules. To the right of Serpens Caput appears to be a bear, marking Boötes and Ursa Major, the Great Bear.