F. P. Mennell — ArcJiwan Stratigraphy. 



259 



across, shows the general structure of the schistose rocks round the 

 Hillside intrusion (consisting chiefly of a remarkable type of augite- 

 microcline syenite). The sketch is rather diagrammatic, owing to 

 the lack of any detailed topographical maps, but though the exact 

 outlines of the various groups may require alteration it may be 

 taken as a fair representation of the facts. The dotted areas are 

 covered by the Conglomerate series, and the lined ones by the 

 Banded Ironstones (altered fine mechanical sediments, characterised 

 by a jaspery appearance, and a banding due to the differences in the 

 iron contents of the various layers), while the unshaded portions 

 are occupied by the schists of igneous origin and other rocks. The 



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Ushers w ■ '■■'■' • .- • ." • 'J- 





Sketch-plan of Hillside Granite Mass, showing relations to the surrounding rocks. 

 Granite-schist boundaries solid, all others dotted. Banded Ironstone, lined ; 

 Conglomerate, spotted. F, Forest Sandstone ; E, Epidiorite, etc. ; S, Chlorite 

 Schists ; G, Granite. 



east and west trend seen at the bottom of the figure is due to what 

 may be termed the Matopo system of folds, as it resulted in the 

 rising up of the great Matopo granite mass, while above there is 

 seen a tendency to parallelism with the edge of the granite to the 



