The basics of geology apply to what can be observed, but assumed that the earth has operated the same way always for billions of years. Basic geology for catastrophism only goes so far back before it is erroneous.
But as I've pointed out once or twice already, this "assumption" is testable. If scientists saw something in the geological record which could
not be explained by the laws of nature, then they would notice.
They'd be the first to notice, because they know what these laws are. Whereas you, and I mean this kindly, wouldn't recognise actual geological evidence for a miraculous universal flood if it bit you in the ass.
So we must either conclude:
(a) The supposed miracle never happened.
(b) God decided to jerk us all around by performing a miracle in such a way that it would look like completely normal geology even to experienced geologists.
Option (b) is known as the "Omphalos" hypothesis, and has widely been dismissed as silly.