38 Annals of the South African Museum. 



shells most probably referable to Bochianites glaber sp. nov. ; the 

 latter has close affinities with European Neocomian forms and 

 occurs at a higher level in the Marine Beds one mile from Eawson 

 Bridge on the main line, up side. It is also worthy of remark that 

 the lowest marine strata found, either at Dunbrodie or in the 

 Zwartkop's Eiver Valley, yielded no single form which suggests 

 stronger affinities to Upper Jurassic than to Lower Cretaceous 

 types ; but those very forms, such as Trigonia tatei Neum. or 

 Tancredia schwarzi sp. nov., which if considered alone might with 

 some reason have been thought to point to a Jurassic age, occur in 

 the higher part of the Marine Beds, associated with characteristic 

 Mollusca of undoubted Neocomian type. 



During his visit to the Sunday's Eiver district in 1905, Mr. Eogers 

 found additional evidence to show that the whole of the Uitenhage 

 beds there exposed were deposited with comparatively great rapidity. 

 He found that forms which are represented in the strata by abundant 

 individuals occur much more generally distributed throughout the 

 whole thickness of beds than was at first suspected. Some of the 

 most typical species of the marine facies (for instance, the familiar 

 TrigonicB) were observed to occur, together with layers of lignite, 

 at the very base of the Sunday's Eiver Beds, where Mr. Eogers had 

 expected to find forms characteristic of the Wood Bed facies. These 

 marine forms occur also 300 feet higher in the series, and since the 

 lower beds of the series were seen to be assuming, in some degree, 

 the aspect of the Wood Bed development, the discovery of the 

 familiar marine forms in them occasioned some surprise. Mr. 

 Eogers noted the occurrence of Hamites near the mouth of the 

 river, where Stow obtained it at first, but he also found it high 

 up the river in a rock which showed resemblance to the strata of 

 the Wood Bed series. He concludes from his observations during 

 this second survey, that Stow must have been led through insufficient 

 collecting to assign a too restricted vertical distribution to various 

 species. Mr. Eogers believes that from the same cause his own 

 records are likely to prove faulty, and that exhaustive collecting 

 \vould still more fully demonstrate the extensive vertical distribution 

 of many of the forms throughout the beds exposed. :;: 



The above considerations lend great support to the results of a 

 comparative study of the fauna, namely, that no forms are known 

 to occur in these beds which give definite indications of the presence 

 of more than the equivalent of a single palteontological stage. 

 Allowing, then, that the cephalopods, supported in no small degree 



* For the published account of the 1905 survey, consult Eogers (2), pp. 15-33. 



