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They were located at N31.74776 W106.25512 in the mesa area which overlooks what must have either been a lake or running water hundreds of years ago. The map image is the tracks and waypoints from the Garmin Forerunner imported into Google Earth, and then cleaned up slightly with Photoshop.
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I took the picture of the shards after we got home with my Nikon digtial SLR.
This place we found them is 4,035 ft (1.230 meters) above mean sea level.