4 PE0CEEDING8 OF THE GEOLOGICAL SOCIEXr. 



" Accompanying these I enclose for the Geological Society a large 

 plan of the district, with the gold-bearing reef marked upon it, with 

 the farms through which it runs, and the names of the various 

 companies on the site of their workings. This may be relied upon 

 as authentic, though a large number of valuable gold properties have 

 been developed since the publication of this plan. 



" Upon the plan I have placed a cross section, almost directly north 

 and south at right angles to the Main Keef. This section covers a 

 little over four miles, crossing the Salisbury claims and passing 

 thrdugh the town of Johannesburg. At the south limit of this line 

 I have obtained the specimens A and B, which are at that point in 

 alternate bands of from 7 to 10 feet thick. A is worked for door- 

 jambs, lintels, &c, ; but the quartzite B is too hard to be worked. 

 The dip of these rocks is towards the south about 40°. From here 

 to the Main Reef is a coarse sandstone, with here and there a 

 narrow reef of barren conglomerate. From the Main lleef north- 

 wards a similar sandstone prevails, having generally the character 

 of C, but (with a redder tinge nearer to the Main Reef) with a dip 

 (southwards) at the northern limit of 7o^. Here it is bounded by a 

 fine-grained purplish-red jaspideous slate (specimen D), permeated by 

 narrow lines of quartz. The jagged edges of this dark-red slate 

 protrude above the surface. 



" From personal observation I am enabled to state that wherever 

 this formation is maintained the reef of gold-bearing conglomerate 

 is found running more or less parallel to it at a greater or less 

 distance to the south. I am not prepared to state the converse ; 

 but the before-named arrangement is true over 20 miles of reef. 



" I trust the specimens and plan may be found helpful towards 

 elucidating the geological problem of the origin of the gold-bearing 

 conglomerate, which has hitherto oscillated between the igneous 

 and aqueous theories. 



" I am, dear Sir, 



" Yours faithfullv, 



" H. Exxon, F.G.S." 



The President considered the occurrence of the gold in large 

 quantities in such a conglomerate was a remarkable and interesting 

 ease. The rock was an ancient-looking one, and the country 

 appeared to have undergone much disturbance. 



Dr. HiNDE remarked that in Nova Scotia beds of conglomerate of 

 supposed Carboniferous age were formerly worked for gold, but the 

 yield had not been very great. 



The following name was rend out for the first time in conformity 

 with the Bye-Laws, Section YI. Article 5, in consequence of the 

 n on-payment of his arrears of contributions : — Dr. R. Haijsler. 



The following communications were read : — 

 ] . "On the Occurrence of the Striped Hyaena in the Tertiary of 

 the Yal d'Arno." By R. Lydckker, Esq., B.A., F.G.S. 



