{ 1. Ochre-coloured calcareous sandstone and sandy { limestone crowded with foraminifera { (_Nummulites Fraasi_, etc.), _Ostrea_, etc. 38 { { 2. Sandy limestone, largely made up of { foraminifera (_Operculina discoidea ?_) 2 { { 3. Sandy shale 2 { { 4. Sandstone, partly calcareous, with much { gypsum 3 { { 5. Calcareous sandstone with concretionary BIRKET { weathering 17 EL QURUN { SERIES. { 6. Shale with gypsum 2 { { 7. Calcareous sandstone 4 { { 8. Shale with gypsum 2 { { 9. Calcareous sandstone, hard and yellowish 2 { { 10. Gypseous shale with numerous small shells { (_Tellina_ sp.) passing down into sandy { limestone. (This bed is the uppermost member { of the Ravine beds) 6 -- Total thickness 78 -- _Base, cultivation level._ To the north of the Lahûn pyramid the beds agree generally with the above. The following are the chief divisions here:— _Top of Hills._ Metres. Gravel Terrace (Pliocene) 22 metres thick. 1. Calcareous sandstone and sandy limestones full of nummulites; also _Ostrea_, etc. 31 2. Ochre-coloured calcareous sandstone or sandy limestone, often crowded with _Operculina discoidea_ and some _Nummulites Fraasi_, etc. 12 3. Sandy limestone with small foraminifera at top and some shells. The upper part of this bed has been quarried 20 4. Shales and shaly limestone; gypsum — -- Total thickness 63 -- The foraminiferal sandy limestones of this series are seen at points in the desert bounding the eastern margin of the cultivation, notably east of Sersena and at the top of the hill 15 kilometres north-east of Rubiat. The following section was measured at the prominent hills 17 kilometres 28° N. of E. (magn.) of Tamia:— Metres.