192 Transactions of the South African Philosophical Society. 



further west than the well, is a vertical height of about 300 feet ; 

 fragments of the lava are met with at intervals along the cattle 

 tracks up it, and outcrops occur on the summit near some Kaffir 

 huts. I followed this lava ridge four miles to the west, where it is 

 cut through by the White Eiver, but the lava is continued at least 



(OERNtY 

 RIVf R 



STA-Tiorv 



Fig. 1. — Section south from Zuurberg. Distance 8 miles. 

 1. Witteberg beds. 2. Lower Dwyka shales. 

 4. Upper Dwyka shales. 5. Volcanic rock. 

 7. Shales, &c, of Uitenhage beds. 



Vertical scale twice the horizontal. 

 3. Dwyka conglomerate. 

 6. Enon conglomerate. 



six miles further to the west behind the red conglomerates of Enon. 

 On the farm Kremlin (on the eastern boundary of the Uitenhage 

 Division) the lava dyke widens out to about 300 yards, and it is in 

 contact on the north side with the Dwyka conglomerate, the Upper 



O ooo ° ooo %^0 





- . / 



~3T 



kVxXx X #\'i ",J x 

 x < x <J*;'x * kji * - ^-__ : 



/ x x x * x x ; !x * * * * 





o 



> 



AAA B^CCCttt 



Lava 



Collie fra-ck 



x * x 

 xxx 



Fig. 2. — Plan of lava and fragmental rocks on Slag Boom. 



shales being cut out. On Slag Boom the volcanic fissure widens to 

 about 800 yards, and the lava is accompanied by masses of red, 

 yellow, and white tuff, and buff-coloured breccia containing a few 

 pieces of quartzite that may have come from the Witteberg forma- 



