438 THE KAEEOO SYSTEM IN NOETHEEN EHODESIA. [Aug. 1 909, 



EXPLANATION OF PLATES XVII-XXIII. 



Plate XVII. 



Map showing areas of the Karroo System in Northern Rhodesia, 

 on the scale of 80 geographical miles to the inch. 



Plate XVIII. 



Conglomerate, Chigona Creek (Lupoposhwe divide), showing juxtaposition 

 of boulders ; looking north-eastwards. 



Plate XIX. 



Disintegrated conglomerate forming the foothills west of Eakannnga Creek. 

 (See p. 423.) 



Plate XX. 



Conglomerate in situ on the southern foothills of Lupoposhwe. 

 Dip southwards. 



Plate XXI. 



Molongushi River : basal clays and nodular ironstones, overlain 

 by coal-measures. (See pp. 414, 427.) 



Plate XXII. 



The Malembi syncline from the north-west, Karroo beds showing in the 

 white cliff. See pp. 419, 433 ; also text-figs. 6 & 7 (pp. 431 & 432). 



Plate XXIII. 

 Fallen block in Eakanunga Creek, looking south-westwards. (See p. 424.) 



Discussion. 



Mr. Lampiegh congratulated the Author on his notable addition 

 to our knowledge of the structure of South Central Africa, and 

 regretted that there would be no time to discuss the many interest- 

 ing points raised by this paper. It was fortunate that the Author 

 had been able to investigate a particular district in this wide 

 country somewhat closely, instead of having to depend for his 

 information entirely upon wide-spaced traverses. The Luano 

 depression appeared to be essentially similar to the remarkable 

 features described as grab en in South-East Congoland, some 

 350 miles farther north, having nearly the same direction. But it 

 appeared that the Luano lowland was bounded by a master-fault on 

 one side only, while on the opposite side the undulating Karroo beds 

 of the floor were carried irregularly up the slopes by the rise of 

 their dip. Though the impressive Machinga escarpment was due 

 in some degree to the stripping- away of the Karroo sediments, its 

 physiographic features, as the Author had shown, strongly suggested 

 that it marked the line of a still-growing fault which had its 

 highest value on the north-east, and had gradually broken back- 

 wards or south-westwards into the heart of the plateau along the 

 synclinal fold. 



