What is marble, O beyond-my-level one?
None of the ways in which you are beyond my level are at all admirable. I am not the one who is misrepresenting the content of mainstream geology on this thread. You have misrepresented what mountains are and what the evidence is from old sediment layers. Now you are misrepresenting what can happen to sediments.
You may disagree with mainstream geology, obvoiusly. However, while anyone is entitled to his own interpretation, he is not entitled to his own facts.
The oldest "sediments" are very rare and often are too metamorphosed to contain discernible fossils, although their isotope signatures may point to life having been present. Look up "metamorphic" sometime.
Despite multiple lines of evidence for a 4.5 gigayear age of the Earth, for a long time the oldest detected lithospheric rock was 3.8 billion. (I think very recently that has been upped to about 4 billion even.) Very little indeed is around from more than three gigayears ago. Immediately Precambrian rocks still aren't very common, although that's only half a gig back. The scarcity or abundance of a given age of rock is a function of that age. That's the picture you expect when the old ones are getting eaten.
Subduction is the answer. We know it happens. It has already eaten most of the oldest rocks on Earth.
In a YEC model, the old ones wouldn't exist at all. Everything would in fact be about the same age, radiometrically, which is younger than springtime. There wouldn't be anything in the world anywhere (if it came from living things) which wouldn't be datable by C14.
Now, that's a creation model making scientific, falsifiable predictions. Hooray!! The only problem is, all the predictions have long ago been falsified.
Marble is calcium carbonate with various impurities acquired as the solution from which it recrystallized passed through other substances. Marble varies considerably from place to place.