I think you are starting down a great path and that you will really enjoy the journey. It's true that Geology was the first science that absolutely nailed the coffin closed on both the concept of a young earth and that there was ever a world-wide flood. Further, geology did this long before we had any method to do absolute dating. The evidence from geology is simply so overwhelming that no one who examined the evidence could possibly continue believing in either of those fantasies.
I would suggest that you start with some of the basics. In particular, read
Geology- working up from basic principles. to start, so you understand a few of the basics, then move on to
How to make sand. for a look at something as simple as sand, then read through
Exploring the Grand Canyon, from the bottom up..
Once you work through those I think you will have a better understanding of the geological column and why both a young earth and some imagined flood are simply silly.
Once through those we can begin looking at dating itself.
Aslan is not a
Tame Lion
™ Version 4.2
