36d Timehri. 



" wuiburi mountain in the Canuku range I found large 

 " banks of pebbles and sand in the Takutu, the pebbles 

 " being chiefly of quartz of a yellow and white colour ; 

 " but also I found some agates of the kind known as 

 " fortification, from the parallel zigzag lines. Other 

 '* pebbles were of globular stru£lure and veined with 

 " jasper like the Egyptian pebbles. Below these beds 

 *' of pebbles and sometimes beside them, I noticed a 

 " black sand with minute quantities of gold of a light 

 " yellow (the italics are not SCHOMBURGK'S) but whether 

 " the metal is present in sufficient quantities to render 

 " washing for it profitable, must be determined by closer 

 " examination than I could give it." 



Again, " Near latitude 3° 12' 53" North, 26^ miles 

 " from Pirara, I saw a remarkable geological feature — a 

 " large block of granite gneiss was surrounded as it 

 " were by contorted masses of gneiss, which rose 2 feet, 

 •' 6 inches above the water. The granite gneiss is 

 " stratified at an angle of 45° pierced by veins of quartz, 

 " and large blocks of quartz lie upon it." 



Again, still speaking of this distrift, he says, " passed 

 " here banks with quartz pebbles, and could trace the 

 " quartz pebbles in the conglomerate, not cemented, for 

 " some distance in the savannahs." In another place, 

 " We crossed at 10 o'clock the creek Canaru, which 

 " flows into the Rupununi. The fragments of quartz 

 " which covered the savannahs appeared more numerous 

 " than on the previous days, sometimes huge blocks of 

 '• the same formation pierced the soil. Our path was 

 " fatiguing in the extreme and our feet blistered and 

 " injured by the sharp pointed rocks." Another quota- 

 tion will suffice to show how abundant quartz is in this 



