ADIORAT SANDSTONES. 1 73 



beds near Dongolo, the vertical dimensions being, of 

 course, greatly exaggerated. The mineral character of 

 the sandstone at Dongolo is precisely similar to that of 

 the Adigrat beds in general. 



No trace of the sandstones was observed further south 

 on the road to Magdala ; all the beds seen were higher in 

 the series, except at one spot, near the camp at Dolo, 

 where a small boss of granite emerges from beneath the 

 limestone. This small patch is so minute that it affords 

 no means of judging whether the sandstones to the 

 southward underlie the limestone or not. Both forma- 

 tions are, of course, quite unconformable to the meta- 

 morphics, and rest upon an uneven surface of them, so 

 that peaks of the latter may rise through all the former 

 sedimentary formations, and only be capped by the 

 highest. 



Passing northward from their southern boundary at 

 Dongolo, the sandstones, as already intimated, cover a 

 considerable tract around Adigrat, and form the lower 

 portion of the great hiU-range west of that town ; thence, 

 to the north, they cross the highest portion of the 

 dividing range between the streams running down to 

 the Nile basin on the west, and those flowing to the salt 

 plain west of Amphila to the east. Their area is very 

 narrow as far as Senafd, but here they expand into two 

 or three broader plateaux, which encircle the upper por- 

 tions of the Komayli and Haddas valleys. The most 

 eastern of these plateaux is Sowera, north-east of Senafd. 

 Further still to the north-east and east, sandstone caps 

 some of the isolated ridges running north and south 



