191 



free stones of a like kind, extending north and south, with 

 the Cambrian basal grits occurring on the rising ground. 



9. Port Victoria. The township is situated on Spencer 

 Gulf, in the Hundred of Wauraltee, about 14 miles to the 

 south-west of Maitland. There is an extensive development 

 of a Pre-Cambrian complex, on both sides of the jetty, on 

 the beach as well as forming cliffs. The chief rock is a 

 pinkish felsite, passing into syenite, often carrying layers 

 and segregations of epidote; various schists (biotite schist and 

 hornblende schist make strong contrasts of colour with the 

 felsites and syenites), gneissic schist, and spotted schist, the 

 last-named being very common. Close-grained felsitic veins 

 penetrate the mass at all angles, and a gabbro, with coarse 

 crystals of diallage and pinkish felspar, makes a striking feature. 

 No typical granite was seen in outcrop, but one or two large 

 coarse-grained granite boulders occurred on the south side of 

 the jetty, indicating a local outcrop not far distant. 



The angle of schistosity is high and the rock commonly 

 weathers into strong ridges. The cliffs, which are of no great 

 height, show vertical folia in relief. The rocks make no sur- 

 face features beyond the edge of the cliffs, while the country 

 behind is typical of the district, showing a light surface soil 

 with much nodular travertine. 



Palaeozoic. 



UPPER CAMBRIAN. 

 Basal Grits and Conglomerates. 



These beds may be briefly described as very siliceous, 

 quartzose, gritty, passing into conglomerates, sometimes 

 ferruginous, somewhat open in texture near the surface (pro- 

 bably from the loss of ingredients by weathering), and 

 generally contain rounded or angular fragments of felspar 

 which are weathered to an opaque white. These inclusions 

 are most numerous where there are outcrops of pegmatite in 

 close proximity, as at Wundersitz's quarry, near Maitland, 

 and in the Winulta Creek. 



The stratigraphical position of these grits is capable of 

 proof. In several cases they are seen to rest directly upon 

 the Pre-Cambrian rocks. Although in no case, to my know- 

 ledge, are their outcrops seen in close conjunction with the 

 Cambrian limestones, yet the Maitland No. 1 Bore shows 

 them interbedded between the Pre-Cambrian granite below 

 and the grey crystalline limestone above, where they have a 

 thickness of 51 feet; and on the western ridge of Yorke Valley 

 the limestones are seen (as surface stones) in close proximity 

 to the basal grits. 



