NUMMULITIC SERIES. 55 



itself. It does not follow that the whole of the rocks in the following 

 list should be present at any one place : — 



Nummulitic series. 



8. Variegated yellowish, light-gray yellowish and pinkish, or gray or whitish 

 limestone or marble, lumpy and marly beds below with Nummulites, 

 Alveolina throughout. 



7. Gray limestone with Alveolina. 



6. Gray limestone, rather darker, containing small Nummulites. 



5. Thick and thin-bedded regular limestone, few fossils, some of the beds semi- 

 oolitic. 



4. Earthy gray limestone and greenish shale with Nummulites. 



3. Dark cherty limestone with few fossils, a few feet only. 



2- Gray limestones and gray or greenish clays, thin-bedded layers, alteolina 

 bands occasionally, or layers with Nummulites. On or about this horizon, 

 brownish sparkling sandstones and gray or greenish-olive clays, with bands 

 of red or purple clay, are locally present in north-westerly sections ; the 

 sandstones being in places conglomeratic. 



1. Greenish clays sometimes gypseous or containing plates of selenite below, 

 sometimes having calcareous nummulitic layers. 



Where the groups 1 and 2 of this list are present, the red zone so 

 prominent elsewhere loses its character and place as next overlying 

 the gypseous series, pale brownish sandstones and greenish clays taking 

 an intermediate position between the gypsum and the now sub-divided 

 and thinner representative of the deep red or purple clay zone. The 

 bands most retaining the general appearance of the latter are usually 

 those nearest to the stronger limestones above, and these red bands 

 are certainly interposed between or intercalated among beds containing 

 Nummulites, thus giving another clue to the fact of the red zone itself 

 and the gypsum into which it passes below by sudden alternation — all 

 belonging to one early eocene period. 



In order to show the difference between the ordinary junctions of 

 the red clay zone and nummulitic limestone and the obscure passage 

 downwards from the latter where the sandy and shaly lower nummulitic 

 beds are present, the sections south-west of Amon Kot and Sharki, 



( 159 ) 



