Abstract
Detailed investigation of the Lower Carboniferous carbonates of the Um Bogma Formation in 49 surface sections and 45 boreholes in west-central Sinai led to the possibility of subdividing this economically important formation into three lithostratigraphic units including from base to top: Ras Samra Member, El Qor Member and Um Shebba Member. These formal names are established here for the first time and are described in detail. Strata-bound manganese-iron ores are recorded from the three members, but economic deposits are confined to the Ras Samra Member only. The lithologic variations of these members and the stratigraphic distribution of the associated MnFe ores are discussed.
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