THE CRETACEOUS SYSTEM 341 



calcite. The fine-grained portion of the rock is greenish 

 and very similar to the sandstones near the Umgwegwane 

 mouth. 



The occurrence of the dolerite boulders in the Em- 

 botyi rock is of great interest, as it proves that the 

 dolerites had been injected into the Karroo formation 

 before the deposition of the conglomerates, and were 

 exposed at the surface during their accumulation. The 

 similarity in situation of the Embotyi group to that of 

 the Umzamba beds, which crop out at a distance of 

 some twenty-four miles to the north-east, and the fact 

 that they are both faulted down against the Table 

 Mountain sandstone, thus belonging to an earlier age 

 than the chief disturbances that have affected this part 

 of the Colony since the close of the Karroo period, make 

 it probable that the Embotyi group belong to the same 

 series as the Umzamba beds. They may be regarded 

 as the basal portion of the Pondoland Cretaceous rocks, 

 and as bearing the same relation to the marine Um- 

 zamba beds as the Enon type of the Uitenhage series 

 does to the Sunday's River beds. 



4. THE NEED'S CAMP SEEIES. 



A few years ago Mr. J. W. Woods of East London 

 sent to the South African Museum a collection of rocks 

 containing fossils from Need's Camp on the Buffalo 

 River twenty miles from the sea and some 1,100 feet 

 above sea level. The rocks are shelly and polyzoan 

 limestones, and from Mr. Wood's description it is clear 

 that they rest unconformably upon dolerite intrusive 

 in the Beaufort beds. 



