It would have been nice to know. I wonder if we ever will. This is the question here: would we even find such tools though? We have a hard time picking out simple stone palm-axes from a mere 50 thousand years ago - would we find or recognize something like that 65 million years gone? Even serious primeval constructions - ziggurats, pyramids... other... ancient geometric thingies... would have crumbled to dust. Vulcanism, subsidence, general decay. What would their tools look like? What if they only worked in perishable materials? Maybe they really only liked wood or something, if they ever got to that point. God, I do wish we could though. Surely, with 12 million years or more in which to work, something would have happened? Or maybe the existence of fifty-foot landsharks with tiny arms inhibits village construction and maintenace, or something. Maybe skeletons is all we'll ever get, if we get anything.