Here are a couple more photos of the now-famous "dinosaur dance floor" in northern Arizona. The top photo/drawing shows a rare imprint of a dinosaur tail dragged across the sand.
The lower one shows the extent of the footprint site in the Navajo Sandstone near Coyote Buttes.
[Credit, Winston Seiler, Univ. of Utah]
Update 7pm: Popular Science posted a gallery of 10 photos of the track site and the local scenery, including an index map.