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I think what Archae was trying to say( and if not I'll say it):<)....is that before we ask ourselves about hydraulic wear we should come to some agreement on how much exfoliation has taken place irregardless of any other effect.
IOW's. let's find out how big the hole is before we start trying to fill it.
Acceptability of method notwithstanding.
In 4500 years(at least) a lot has happened to the Sphinx, but it has never existed in a vaccuum.(my aplogies to trans=dimensional theorists)