11. The most significant remains uncovered there are referable to the large sauropod " Diplodocus ". 12. Inside the improvised corral they encounter a creature similar to Diplodocus , but with a tame demeanor. 13. Molars came later in their evolution ( as earlier in cerapods and " Diplodocus " ). 14. "Diplodocus " has been a frequent subject in dinosaur films, both factual and fictional. 15. The museum gained prominence in 1899 when its scientists unearthed the fossils of " Diplodocus carnegii ". 16. In 1923 Gilmore and Boss collected a " Diplodocus longus " in Dinosaur National Monument, Utah. 17. The best specimen the team uncovered on July 4, 1899 was a nearly complete fossil skeleton of Diplodocus . 18. Fossil remains of " Diplodocus " have been recovered from stratigraphic zone 5 of the Morrison Formation. 19. Diplodocus 'head would have hung down like the head of a hammer, hovering just inches above the ground.20. The " Diplodocus "-like skull has demonstrated that titanosaur skulls vary more than was previously believed.