502 PROFESSOR J. W. GREGORY. 



from the north-western edge of the second plateau, is an exposure of a marl contain- 

 ing Salenia dombiensis, var. triangularis, " S." injiata, Epiaster catumbellensis, and 

 some molluscs which have been identified by Mr R. B. Newton as Neithea sequicostata, 

 Lima cf. itieriana, Trigonarca diceras, Mrhilaia cr. nerinazformis. 



Mr Newton compares these fossils with Turonian, Cenomanian, and Albian species, 

 the affinities being strongest with the Cenomanian. This conclusion is supported by 

 the ammonites, which prove that the bed is on the injiata horizon and therefore 

 Lower Cenomanian in age. 



The only satisfactory interpretation of the section to the south-east of Lobito is 

 that the high level of the injiata beds here is due to faulting, and that the face of 

 the hills between the second and coastal plateaus is a fault scarp. The smaller faults 

 between the 800-foot scarp and the cliff at Old Lobito are probably due to the beds 

 having been somewhat compressed between the two major step faults. 



(3) From Lobito to Hanha. — The coast cliffs from Lobito north-eastward to the 

 mouth of the Hanha River give good sections of the Cretaceous beds. The rocks 

 along the shore of Lobito Bay consist chiefly of the injiata marls, but exposures of 

 the hard shelly limestone rise from befow them near the second and third gullies 

 from Old Lobito. The first part of the coast section consists of a straight scarp ; 

 the plateau surface is even except where it is notched by valleys, most of which are 

 hanging valleys, though a few have been cut down to sea-level. There are some 

 overthrust faults with the downthrow on the south-western side. Further on the 

 beds show repeated changes in dip and are broken through by groups of parallel 

 faults. I landed about an hour's sail west of the Hanha River, on a beach whence 

 Lobito Lighthouse bears 226°. The beds there dip 25° seaward, and include a hard 

 limestone and a bed containing numerous small fossils converted into ironstone : one 

 of the ammonites Mr Wordie has provisionally identified as " S." gracillima, Kosmat, 

 from the lower Utatur beds (Cenomanian) of Southern India. A brachiopod has 

 been determined by Mr R. B. Newton as Terebratula depressa. 



The first plateau is here about 150 feet high. Behind it is a second plateau 

 rising from about 400 to 540 feet; it ends at the foot of a line of hills. Along the 

 path leading south-westward to Lobito the algal limestone is exposed at the foot of 

 this upper scarp. To the east-north-east towards Hanha a road cutting has exposed 

 beds containing many Epiaster catumbellensis, which is associated with " S." injiata. 

 A road section at the edge of the plateau overlooking the deep valley of the Hanha 

 exposes the following in descending order : — The injiata beds with Akera gregoryi ; 

 a chalky limestone containing chert in nodules and veins, shell casts, and Astroccenia 

 cf. konincki, Ed. and H. ; a massive white limestone containing a few shell casts : it 

 is cut through by a fault with a downthrow of 3 feet to the west. Below this white 

 limestone is a sandy limestone. The section is there crossed by a crushed white lime- 

 stone, to the east of which is a massive-jointed limestone dipping 4° westward ; this 

 is cut off to the east by a broad band of crushed rock due to a fault which hades west- 



