2. Vertical-faced bed of greenish clayey sands and sandy clays (glauconitic) with _Carolia_, _Ostrea_ and _Nummulites_. Near top of bed there is much gypsum. The nummulites in this bed are often collected together so as to form hard concretionary masses; these masses, by becoming more numerous, finally form a hard bed of nummulitic limestone intercalated in the clays near the top. The junction of the clays with the limestone of Bed No. 1 is very irregular 16 3. Greenish shelly sands and sandy clayey bands, interbedded with impure chalky nummulitic limestones with _N. gizehensis_, _N. curvispira_, and a third smaller species; _Ostrea_ sp. This bed is much obscured by debris 11 4. Hard slate-blue shales, weathering to paper-shales 2 5. Brownish marls passing up into clays 2 Limestone band largely made up of small and large nummulites and echinids 1 Glauconitic (?) and clayey sands and sandy clays, with _Ostrea_, _Carolia_, and nummulites, weathering with a vertical face. In some bands large numbers of small and large nummulites lie embedded in every position, as if tossed about by currents during the process of becoming buried by sediment. Gypsum occurs in thin veins and often encloses the nummulites 36 6. Hard markedly-white nummulitic limestone full of _N. gizehensis_ and other species (_N. curvispira_, etc.); the rock usually has a dark brown colour when freshly fractured. A shelly band rich in corals occurs nine metres from the top. The upper part is more marly and less nummulitic than the rest of the bed. Base invisible 30 --- Total thickness of beds in the above section 129 --- [Illustration: PLATE V. ALLUVIAL DEPOSITS OVERLYING MARLY LIMESTONES (RAVINE BEDS) IN EL WADI, RAVINE NEAR QASR GEBALI.] The following is a section of the beds exposed in Wadi Muêla compiled from a paper by Mayer-Eymar on this oasis:— _Top._ Metres.