Yol. 56.] FOSSIL CORALS AND ECHINIDS OF SOMALILAND. 29 



Localities. N. Lat. E. Long. District. Altitudes 



in feet. 



Dobar 10° 20' 45° 5' Guban appr. 800 Coarse syenitic gneiss. 



Busti 10 16 45 4 „ „ 900 Gneiss. 



Bibendula .. 10 10 45 5 „ „ 1000 Ampbibolite-schist. 



WaggaMt 10 2 45 25 Golis ,,4000 Gneiss, mica -schist, 



chloritic schist, and 

 amphibolite. 



Duban 10 10 45 25 Guban ... Gneiss and pegmatite. 



'HauKideali' Wagga ... Gneiss (coll. by Miss 



F. Gillett). 



Daimoli 10 7 45 3 Guban 3094 Gneiss and amphibolite, 



B DlimoH ihinand } 10 9 45 4 „ Gneiss. 



III. The Somaliland Limestones. 



In 1896 it was uncertain whether the limestones were restricted 

 to the Guban or whether any member of the series occurred on the 

 northern part of the plateau. This point was important, as upon it 

 depended the question whether the Haud had been below sea-level in 

 Kainozoic times, or whether it was part of a very ancient land-area, 

 round the flanks of which the limestones had been deposited. 



The collections now prove conclusively that marine limestones of 

 Cretaceous and early Kainozoic date do occur on the summit of the 

 Haud. This view appeared probable, on account of the abundance 

 of irregular chert-fragments scattered over the surface of the plateau ; 

 but this evidence was not conclusive, as the cherts might have 

 been carried up by the makers of the Palaeolithic stone-implements 

 found upon the plateau. The existence of the high-level limestones 

 is demonstrated indirectly by the occurrence of thick deposits of 

 calcareous tufa at various points on the edge of the Haud, as at 

 "Wagga, where some beds of tufa with leaf-remains are exposed, at 

 Gedais and at the Upper Sheikh Pass, where there are encrustations 

 of compact stalagmitic limestone. These deposits show that there 

 must have been some considerable amount of calcareous rock at 

 higher levels than that at which the tufa now occurs. Fortunately 

 there is also direct evidence, as Mr. Aylmer has collected specimens 

 of limestone in situ at the following localities : — 



Localities. 

 Sok Soddah 



Altitudes 

 in feet. 

 4300 





4000 



By highest point of 

 Abdullah Ismail . . . 



Between Burao and 1 

 Bur Dab I 



about 5300 

 „ 3000 



Derkamli Libah, \ 

 south of Burao ... J 



„ 3000 



Position. 



South of the Kugga Pass. 



A spur of the Golis, north-east of 



the Rugga Pass. 

 South of the Golis, west of Sheikh. 



The Haud, approximately 9° 20' lat. 

 N. & 45° 50' long. E. 



The Haud. 



At Burao and Derkamli Libah the rocks are banded cherts and 

 foraminiferal limestones. Limestones have also been recorded by 



