﻿Vol. 6 1.] THE TERTIAKY FOSSILS OF SOMALILAND. 157 



fragmentary casts of large turriculate shells belonging to the genus 

 Campanile of the family Cerithiidse, which, on account of certain 

 plications on the columella, were erroneously considered as Nerincea 

 and consequently of Cretaceous age ; there are also large casts of 

 Luciniform shells, as well as other lamellibranchs and gastropods to 

 which special reference need not now be made. It is sufficient, for 

 the present, to state that the forms of mollusca here indicated are 

 characteristic of Eocene rocks generally, and that with regard to 

 the specimens from Somaliland further evidence is afforded of their 

 Eocene age by the presence of certain foraminifera which enter 

 into the minute structure of the limestone-matrices. 



The new collections embrace no older fossils than may safely be 

 ascribed to an Eocene age, excepting some remains of ammonites 

 and belemnites found by Major Leckie in the Eilo Range of Western 

 Somaliland, which belong to Mesozoic rocks, and are therefore not 

 considered in this paper. 



The corals described by Prof. Gregory came from the 'Uradu' and 

 1 Dobar ' Limestones, these formations being regarded as Turonian 

 and jNeocomian respectively, although he thought that the upper 

 part of the Uradu Limestone might be of Eocene age, on account of 

 the discovery in its structure by Messrs. Sherborn & Chapman of 

 Nummulites, Amphistegina , and Orbitoides dispansa, all of which 

 were found associated with a large Conoclypeus (?) sp. described in 

 the same memoir. No nummulites have been detected in the 

 present material, but Operculum bomplanata 1 has been determined, 

 together with Amphistegina and Orbitoides dispansa. This par- 

 ticular form of Orbitoid, exhibiting rectangular chambers in 

 the median plane, is acknowledged by most authorities on the 

 Eoraminifera to be indicative of an Eocene age. 



It is evident, from an examination of the specimens in these 

 different collections, that there are two limestones represented — 

 an upper one, which is a massive cherty rock, frequently reddish- 

 brown externally; and a lower, of less cherty character, and 

 generally of a lighter colour, although sometimes red- stained. 

 According to Major Leckie, these two sets of limestones are 

 conformable to each other, and therefore without any great 

 difference in age to account for. Further, they may be regarded 

 as the equivalents of the so-called ' Uradu ' and ' Dobar ' Lime- 

 stones, previously diagnosed as Cretaceous but which now appear 

 to belong to Tertiary times. 



These Somaliland limestones are probably capable of correlation 

 with those of South-Eastern Arabia, as well as with those of Scind 

 and Cutch in India ; for, according to the researches of H. J. Carter, 

 Orbitoides dispansa,Operculina, etc., occur in all three regions of Asia. 

 Carter 2 also referred to the occurrence of molluscan casts in the 



1 As understood by W. B. Carpenter, W. K. Parker, & T. R. Jones, 

 ' Introduction to the Study of the Foraminifera ' Ray Soc. (1862) pp. 247-62 

 & pi. xvii. 



2 ' Memoir on the Geology of the South-East Coast of Arabia ' [reprinted, 

 with alterations and additions, from the Journ. Bombay Branch R. Asiat. Soc. 

 1852, vol. iv], Geological Papers on Western India, etc. (1857) pp. 551-627. 



