Given we have no evidence for artificial structures during the time period the next best indicator is probably geographical distribution. This immediately flags up Iguadon though as a herd based herbivore it's likely these played the role of cattle to any civilised carnivore that may have been...
Quote:I don't understand why you'd come to a discussion forum, and then proceed to reap from visibility any voice that disagrees with you. If you're going to do that, why not just sit in front of a mirror and pat yourself on the back continuously?-Esquilax
Evolution - Adapt or be eaten.