Forgive my schoolboy geology but isn't calcium carbonate just chalk which in turn is just a very fine grained limestone which is a term applied to any sedimentary rock consisting of carbonates.
I reckon if you took a poll of the geological composition of most of the great monuments & buildings of the world, you would find a great proportion of them to be built of these materials.
As for the fertile region- A greater proportion of the monuments in the above poll would be built in a 'fertile region' with some name eluding to that fact.

Finally, it's not very polite to start a brand new thread with a personal attack on a fellow contributor.
Etiquette demands that you allow them to make the first move before letting the vitriol flow.