224 THE VOLCANIC BEDS 



Around the great Belmore volcano between Barkly 

 and Khodes a large area appears to have subsided after 

 the earliest eruptions, the basin so produced being sub- 

 sequently filled by lavas and tuffs. A similar area of 

 subsidence was found along the Kraai Kiver west of 

 Barkly. 



Over a wide area in the south-west of Barkly a thick 

 bed of reddish rudely stratified volcanic ash directly 

 overlies, and at places grades into the Cave sandstone. 

 At the Barkly Pass, in the vicinity of the large volcanic 

 neck on the farm Tulloch (Elliot), the ash band reaches 

 its maximum thickness of 350 feet. The section at the 

 Tembu Pass, a few miles to the east, is as follows : 



5. Bedded lavas 350 feet 



4. Purple stratified ash . . . 80 ,, 



3. Cave sandstone 30 ,, 



2. Bedded lavas ... . . 50 



1. Cave sandstone ...... 800 ,, 



Further to the east the ash-beds disappear and the 

 lavas rest directly upon the Cave sandstone, which is no 

 longer divided into two portions. 



In the Stormberg area, according to Mr. Dunn, ash- 

 beds are present towards the base of the volcanic group. 

 In Herschel, Basutoland, and Griqualand East the 

 development of ash-beds between the lava-flows is very 

 restricted. In Matatiele, on the crest of the mountain 

 behind the farm Eyrie, there are two bands of sandstone 

 and shale intercalated between thick flows of lava. The 

 section through the upper part of the mountain at this 

 locality is in downward order : - 



