CONTRIBUTIONS TO THE GEOLOGY OF BENGUELLA, 



521 



A. The Mesozoic Rocks. 



Their chief representatives are the Cretaceous beds, of which Choffat's classifica- 

 tion may be summarised as follows : — 



Senonian 



Turonian 

 Cenomanian 



Vraconnian 



Albian 



Sandstone with Cardita, Rondaireia, etc. 

 Limestone with Inoceramus langi. 

 White coral limestone with Nerinsea capelloi. 

 Marly arenaceous limestone with Epiaster and 



Cyprina ivensi. 

 Marly limestone with " Schloenbachia" inflata, . 



Epiaster, etc. 

 Marls with " Acanthoceras " * mammillare, Salenia 



dombeensis, Algse, etc. 



The Cretaceous beds seen near Lobito appear to represent only the Albian and 

 the Vraconnian (Lower Cenomanian). A few anomalies appear in the distribution of 

 the fossils. For instance, Salenia dombeensis, which Choffat records at Dombe 

 Grande in the Albian mammillare marls, I found only in almost the highest fossil- 

 iferous bed above sea-level; it was there associated with "S." inflata and Epiaster 

 catumbellensis, which according to Choffat characterise a higher horizon. Such 

 extensions of the range of the fossils is naturally to be expected with further collect- 

 ing. The correlation of the beds near Lobito from Hanha to Catumbella appears to 

 be as follows : — 



Age. 



Catumbella Gorge. 



S.E. of Lobito. 



Hanha. 



, 



Inflata marls 



Inflata marls with Salenia 



Inflata beds 





Cheity, shelly limestones 



dombeensis, var. triangu- 



Epiaster beds 





Haematite nodules and 



laris, and Epiaster catum- 



Chalky limestone with 





Neithea angolensis 



bellensis 



chert nodules 



Vraconnian . \ 



Limestones with Panopea 



Limestones with gastropod 



Massive shelly limestone 





plicata and Pholodomya 



casts, T r achy car dium 



Sandy marls 





vignesi 



syriacum, Trigonia, 



Limestone with Astrocoenia 





Epiaster marls 



crinoid ossicles, anne- 





I 





lids, etc. 







Algal limestone 



Algal limestone 



Algal limestone and sandy 





Clays, and marls with bands 





limestone 



Albian 



of torrential gravel 





Clays with torrential wash 

 Gypsiferous marl resting 



V 







on gneiss 



The general relations of the fauna, as remarked by Choffat (1895, p. 89), are with 

 the Cenomanian of the Mediterranean basin, though some of the fossils occur also in 

 Southern India and Zululand. 



The ammonites " S." elobiensis and " S." inflata range northward along the West 



* According to current nomenclature Douvilleiceras. 



