R Avry Wilson Wrote:
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> This is incorrect. Tura is ftom the east (makes
> the casing) while core material is from the
> Mokkatam Formation at Giza (do not confuse with
> Mokkatam Mountain). See here:
>
> [www.geocaching.com]

I’ve puzzled over 19th-century references to “the Mokattam” and of course in this context talk of the Mokattam Formation would be anachronistic and misleading. Sometimes it seems to be a vague designation which one would understand to include Tura, as when Birch writes of the “quarry-marks” being “upon the blocks which have been transported from the Mokattam” and absent from “the stones quarried upon the spot”.

M.