-^ Geology and Minerals 



South-east Africa, and l)elieved at that time he had picked 

 up a handful of diamonds. Greenstone or diorite and olivine- 

 diahase (an old eruptive crystalHne rock) are found in the 

 Mesurado peninsula, also in the region of the Cestos River. 



Laterite (disintegrated gneiss), as already mentioned, over- 



207. QUARTZITE OUTCROP NEAR THE ST. PAUL'S RIVER 



spreads the rocks of much of the coast formations. It is 

 spongy and pitted with shallow holes, but hardens under 

 exposure to the sun and weather. It is often intensely red in 



5'^ 



