Aside from the main, large and obvious rossette in the bottom of this picture, the rossettes actually continue around in a pattern clockwise to the top of the fossil piece around the outside perimeter.  One is fairly clear at the very top of the fossil.

Here's a close up of the rossette pattern.  These may have been coloured on the dinosaur, as they were apparently very prominent.  Just visible in this photo, if you look closely at the edge of the fossil, just to the right of the rossette you can see a thick, darker shade of lamination in the rock.  This is actually permineralized dinosaur skin, not an imprint.
 

This burial stone depicts a man feeding what appears to be some Sauropod he is riding.  Depicted very clearly in the art are the rossette patterns we are now finding on fossilized Sauropod skin.

Here is the burial stone depicting a man, holding something similar to a peace pipe and riding an obvious Triceratops.

These stones were carved and buried with the dead by the Nasca Incans, depicting a part of the life of the person in the tomb.