I believe you have confused uniformitarianism with gradualism. Uniformitarianism, in geology, is the belief that the same processes causing geological changes today, caused them in antiquity. It does not start with a presumption of an old earth.
Tisdale.david 13:57, 1 June 2007 (EDT)tisdale.david
I do not see any correlation between the theory of Dinosaurs extinction and various geological theories of how the Earth has come to be. The Dinosaurs, for instance, may well have been made extinct by a comet. However, this in no way disproves - or proves - the theory of Uniformitarianism or Gradualism, any of these theories of creation may be true, even if a comet wiped out the Dinosaurs.
In fact, it begs the question, if Dinosaurs were so numerous and varied, and they existed at the same time as human beings, then how were we not made extinct at the same time? Entheogenicorder 16:12, 31 January 2008 (BMT)