Another point that occurred to me: While we're discussing possible saurian civilization; we'd better define a term - civilization.

What exactly defines civilization for our purposes?
The dictionary defines it as "An advanced state of intellectual, cultural, and material development in human society, marked by progress in the arts and sciences, the extensive use of record-keeping, including writing, and the appearance of complex political and social institutions. "

This definition is entirely human-oriented though. How do we determine civilization in nonhumans?
Would they need to build villages, or will caves do? Do they need to discover fire? Do they need a method of record keeping? What about culture?

We are (sarcastic political comments aside) civilized. As were the ancient Greeks. So what about the - say - ancient Celts? Before them; how about early man - the Clovis peoples, for example? How about the Neanderthals?
At what level of sophistication to we draw the line of 'civilization'? If we want to discuss saurian civilization; I think we'd better define it first.