162 



quartzites and sandstones of the superimposed Griquatown series, not to 

 mention the vast superficial deposits of sands and surface quartzites, 

 become apparent, and considerably dimmish the proportions of available 

 lime. 



The following table shows the results of analyses of these soils : 



V. CAMPBELL RAND SOILS. 



Division. 

 Vryburg. 



Farm. 

 Kuruman. 



Geluk. 



Stowf distinguished between the ro'cks of this series and the olive 

 shales, as he termed them, deposited unconformably over the ancient 

 schistose rocks underlying the crystalline limestone of the Campbell 

 Band. The analyses given in the next table are those of soils which may 

 be taken ae representing this deposit of shales. 



VI. QUARTZITES AND SHALES EAST OF CAMPBELL RAND (STOW'S OLIVE 



SHALES). 



Division. 



Farm. 



Hopetown. Fluitjes Kraal. 

 BarklyWest. H.V. 75. 



Vryburg. 



Ganzepan. 

 Salisbury. 

 Middle Park. 

 ii 



Mogogong. 



Banksdrift. 



Fine earth. Water. Lime. 



90-0 

 97-3 

 94-6 

 94'6 

 93'8 

 95'4 

 88-2 

 73-5 

 82-5 

 76'6 

 80-9 

 73-0 



Although one or two of the soils enumerated in Table VI. are of 

 fairly good quality, nearly all of them show a deficiency in potash and 

 phosphoric oxide, while several lack lime as well. The Ganzepan soil 

 forms a remarkable exception, and its chemical richness is doubtless due 

 to the fact that it was collected at the very foot of a great doleritic out- 

 crop, from a valley whose brown loam is evidently largely derived from 

 the surrounding dolerites. For this reason it would be misleading to 

 include the soil referred to amongst the averages of the above shale-de- 

 rived soils, which are as follows : 



Lime '048 



Potash '055 



Phosphoric oxide '031 



fGeol. Soc. Quarterly Journal, Dec. 1874. 



