 Well, the most complete stegosaurus skeleton ever discovered is going up on the auction block, much to the chagrin of paleontologists. The Jurassic period fossil named Apex was put on display at Sotheby's in New York Wednesday. Apex is around 150 million years old, measuring 11 feet tall, nearly 27 feet long. The auction house says Apex could sell for up to $6 million when it goes up for sale on July 17th.