>RE-CAPE ROCKS OF THE NORTH OF THE COLONY 91 



the results of both these processes can be seen, but the 

 formation of the highly ferruginous breccia is best de- 

 veloped in the Maremane anticline, a broad limestone 

 area with numerous outliers of the Lower Griqua Town 

 beds. The peculiar rock called the Blink Klip breccia 

 from its occurrence at a place of that name near Post- 

 masburg, where the abundance of small crystals of 

 specular iron in the rock give it a glittering appearance, 

 is the extreme stage reached. 1 



The breccia occurs in two long narrow ridges, the 

 Klip Fontein and Gamagara hills, the latter over thirty 

 miles long, and in many smaller outliers. At Wolhaar's 

 Kop it is still in connection with higher beds in the 

 series, elsewhere it is either uncovered, or, as at Gama- 

 gara, directly overlain by the Matsap beds. At Blink 

 Klip itself, the breccia is seen to fill a Wide fissure or 

 cavity in the Campbell Rand beds, for the latter are ex- 

 posed in contact with the breccia far above its base ; 

 but elsewhere the relations of the two rocks are not so 

 obvious. In all the large masses of breccia, which may 

 exceed 400 feet in thickness, the lower parts are made 

 of smaller fragments and have more ferruginous matrix 

 in proportion to rock fragments than the upper. In 

 many cases a general increase in the size of the frag- 

 ments upwards is noticeable, and many blocks of thinly 

 banded rock are found on close inspection to have been 

 shattered, but the innumerable fragments are but slightly 

 displaced and are cemented together by a ferruginous and 

 siliceous matrix. 



1 Details as to the occurrence of this rock will be found in G. C., x., 174, 

 and xi., 35. 



