61 



to trace its outcrops for any appreciable distance. There is no 

 doubt, however, that the bands occurring in Sections 3347 and 

 1032, Hundred of Munno Para, extend north into Sections 

 1728 and 3095, Hundred of Barossa, while the line of outcrop 

 of the western Para Wirra band can be easily followed in 

 Para Wirra for a distance of nearly three miles, is on entering 

 Barossa only well exposed on the road leading between Sections 

 107 and 106, becoming entirely obscure in Section 105. 



Quartz A'eixs. 



The primary object of the geologist is simply to characterise 

 the stratigraphicai relation of the beds upon which he essays to 

 treat. But the district of Barossa being one, in some measure 

 at least, associated with mining enterprise, and the subject of 

 discussion, viz., " quartz veins," being fraught with much 

 interest to the public — especially to those engaged in a mining 

 venture — as to the percentage of their metalliferous contents, 

 for this reason it is with considerable diffidence to suit the 

 various feelings I approach this part of my subject. Also, 1 

 trust, the scientist in this particular walk will kindly correct 

 any inadvertency into which the following remarks may tend 

 to lead. 



On the north bank of the South Para Kiver, in allotment 

 337, there occurs a quartz vein of considerable thickness in 

 connection with numerous leaders, or rather subsequent in- 

 filtrations, of quartz throughout the adjoining clay-slate; the 

 dip and strike of the vein itself is apparently in conformity 

 with the lay of the surrounding beds. A vein of quartz in 

 Section 479, Hundred of Barossa, is of considerable thickness, 

 but is barren of metalliferous properties. Another which ex- 

 tends south into Munno Para is exposed in uniformity with the 

 dip and strike of the slate rocks in the precipitous bank of the 

 river in Section 3095. The apparent strike of this vein leads 

 me to conclude it to be the southern continuation of the vein 

 exposed on the southern side of Spring Gully in Section 482. 

 Here the vein-stuff is composed of barren massive white quartz, 

 and over twenty feet in thickness, which on the northern side 

 of the ravine is entirely hid from view by the overlying ]Miocene 

 beds. On the south side of the gully, in the same section, to 

 the west of this reef a heterogenous interlamination of slate 

 and quartz peeps out, and is traceable for a considerable dis- 

 tance conformable with the general strike of the beds. This 

 phenomenon, has, however, evidently no direct connection with 

 any well-defined system of quartz veins, but is merely one of 

 those nest-and- string-like occurrences so frequently found 

 displayed throughout the slate rocks of the neighbourhood. 



jSTorth-east of Gawler, in the bed and south bank o£ 



