162 GEOLOGY. 



SECTION 11. 



LIST OF GEOLOGICAL FORMATIONS. 



The various rocks observed ia Abyssinia and described 

 in tlie subsequent pages are the following. They are 

 enumerated here in descending order, though, as is 

 usual and most convenient in geological descriptions, 

 they will be treated in the reverse sequence, commencing 

 with the lowest. Local names have been given from the 

 most important places at which the rocks of each group 

 are well developed :— 



6. Recent formations — Soils of the highlands, coral 

 islands of the Red Sea, alluvial deposits near 

 the coast. 



.5. Aden series of volcanic rocks bordering the Red Sea. 



4. Trappean series : — 



A. Ashangi group. 



B. Magdala group. 

 8. Antalo limestones. 



2. Adigrat sandstones. 

 1. Metamorphic rocks. 



After passing the volcanic formations on the coast, the 

 route lay over a simple ascending series of rocks as far as 



