In my opinion it is beyond all reasonable doubt that the recently discovered marks behind the blocking stone in the QC "airshaft", which were recently discovered by drilling the block and inserting a miniature camera, are contemporaneous with at least one stage of the pyramid construction.
There is debate and contention as to the originality and provenance of all other markings that are, and have been directly accessible by humans.
It is my understanding that the marks behind the blocking stone in the "airshaft" have not yet been deciphered.
They are of unknown meaning and purpose.
Post Edited (19-Jun-15 21:46)