I have the book "The Pyramids: An Enigma Solved" by Joseph Davidovits and Margie Morris. It certainly made good sense to me. They book shows photos of blocks that have been broken to reveal shell and other fossil material that is all jumbled up rather than layered as in natural limestone rock. Certainly the Egyptians did go to the effort of quarrying very large stones, but most of the ~2 million stones of the Great Pyramid were evidently made from a concrete mix.
Here's an old post where we discussed Davidovits' theory:
By the way, we are now up to about 400 visitors per day at DomainOfMan!
To answer your other question about chronology, although Chart 14b is designated as an "alternate" chronology, it is the one I'm personally working from. I haven't updated the other charts to reflect the impact of that change. For now, I think it is best to concentrate on understanding the relative chronology of the ancient world. It would be nice to have an accurate absolute dating scheme, and this should be a goal, but there will be no consensus on this any time soon. The current stand of most academics is that no major revision in chronology is appropriate. (As they say in AA, "admiting you have a problem is the first step toward recovery", and academia is not there yet! They're trapped in a "matrix". Aren't we all.)
The catastrophe that preceded the Old Kingdom would be the one of 1159 B.C. This places the end of Sargon the Great's reign about 900 B.C. You would need to work forward from there to get the approximate dates you are looking for. But again, it's probably more useful to know what else was contemporary with a given king or dynasty rather than the exact date that it existed.
Do you have reason to doubt the chart from the link you provided recently?
Obviously it would be based on conventional chronology. Present academic thinking also attributes building of the Giza Pyramids to the Egyptian Old Kingdom, which is incorrect. These monuments were erected in earlier times and only spruced up during the Old Kingdom. Middle Kingdom pyramids were built out of mud brick. This suggests that they too realized that it was not necessary (i.e., traditional) to quarry the blocks for a pyramid, even if the art of cement mixing was lost. The manpower required to build New Kingdom monuments might also need to be brought back into question. For example, many monuments attributed to Ramses the Great are now thought to have been usurped from Amenhotep III.
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