If it is restoration and repair it means that repair work was being carried out immediately after construction (conventional construction dates) or even during construction.
Then we have the problem of getting the material into the core through the presumably extant casing.
I'm thinking that at the time of repair the casing was either in a disheveled state thus allowing penetration, or
for me a more likely scenario is that the casing was already removed or partially removed. No Casing.
The restoration crew may have attempted casing repair/renewal. There's a lot of later work going on at very low levels, To be quite frank, applying a casing onto an already existent core, such as we see today would be quite impossible, every single casing block would have to be custom measured cut and placed, no two the same.
I really find it difficult to believe that the original builders, (as evidenced by their other work within the monument) would have been stupid enough to build a rough core and then attempt to apply a fine casing.
Much better, easier and obvious to build casing first, course by course and then back fill.
For this line of thinking the arbitrary dates are of little consequence, what is important, are the relative dates.
Which came first/last and where.
Edited 2 time(s). Last edit at 18-Jun-16 20:11 by Jon Ellison.