Cladking,

You've mentioned this "cold water geyser" several times before, enough to interest me enough to research.

[www.uweb.ucsb.edu]

The problem as I see it is twofold;
1) There is no evidence of these in the past in the area. Since they are not tetonic activity driven, how would you explain their "shut down"? If from changes in the deep aquifer, what changes?

2) Such geysers tend to deposit broad swaths of what's called "Geyserite", minerals released in a precipitate. I've never seen records of such deposits in Egypt. How do you account for the lack of precipitate that should be left as an event record?

Your idea is interesting, but, at best, I would classify it as dubious unless you can demonstrate the above effects are there; merely overlooked.

Jammer