1. Soft brown sandstones and sandy beds, much obscured 7·6 2. Sandy beds, passing up into a very hard grey concretionary sandstone, showing ripple-marks 4·6 3. Thin-bedded dark sandstones, mostly very hard 1·5 4. Hard compact thick-bedded grey sandstone, very concretionary, false-bedded 2·1 5. Shaly sandy beds with ferruginous concretions 1·5 6. Brown impure limestone 0·6 7. Soft variegated sandy beds and sandstone 9·0 8. Rather friable buff-coloured sandstone, more or less false-bedded, with peculiar iron-staining 6·0 9. Gray rather concretionary sandstone, with dark-brown ferruginous bands 3·0 10. Brown crystalline limestone with calcite, passing into harder grayish crystalline limestone, flinty at top 6·1 11. Gray marls and shaly clays 3·0 12. Brown crystalline limestone 0·6 ---- 45·6 _Base._ (Sandstones and clays of Division 7.) In Jebel Hefhuf, the long narrow ridge-shaped hill a few kilometres south-east of El Bawitti (Plate VII), the beds of this series are implicated in the fold, and are found tilted at angles of 30 and 40 degrees. They here consist of a considerable thickness of crystalline limestone, calcareous grits, shaly clays and sandstones; the softer beds always form a gully between the harder. The following were noticed at a point about 7 kilometres from the western end of the ridge:— _Top._ Metres. Calcareous grit, usually siliceous, with bones } (often a true bone-bed). } } Sandy clays, etc., with silicified wood[45] } } Thick-bedded brown sandstone, siliceous and } 21 ferruginous in part. } } Green and gray iron-stained sandy clays } } Thick-bedded brown crystalline limestone }