After Dr. Sereno and his team have a detailed blueprint for Jobaria's skeleton, it is almost time to build the skeleton. But Jobaria's bones are too heavy and fragile to mount for display as a skeleton. The thigh bone of the adult, for example, weighs almost 1400 pounds. It would be hard to mount it high in the air!

To recreate Jobaria, the original fossil bones were all copied. In order make exact replicas, a mold had to be made from each bone. Then, a replica (cast) was made for each. Jobaria's casts were made out of resin or fiberglass.

In this picture you can see the lightweight plastic replicas of Jobaria's bones about to be assembled as part of the skeleton.