265 



in their dip. Following the Mount Pleasant road, in a south- 

 east direction, the basal grits, in a very decomposed condi- 

 tion, appear in the road cuttings. Thin veins of pegmatite 

 are seen in the sections. About half a mile from the South 

 Para River, on the same road, good sections are visible of 

 these beds, with pegmatite veins, up to 22 inches or more, 

 cutting obliquely across the bedding. 



By following a district road, near Kangaroo Gully, tliese 

 beds can be instructively studied, as they make very exten- 

 sive outcrops on the ridge which runs south to the South 

 Para River* including Sections 125, 126, 127, 136, and 222, 

 Hundred of Barossa. 



The beds are more highly metamorphosed than those of 

 the Aldgate district, which can be explained from the fact 

 that they are situated more easterly, and therefore more 

 within the zone of metamorphism which becomes more and 

 more marked in that direction. Instead of the felspathir 

 cement, as in the Aldgate grit>s, mica is developed, and the 

 stone often resembles a micaceous schist, whilst preserving 

 the bedding-planes. 



Ilmenite is present to an extraordinary degree, showing 

 bedding-planes and cross-bedding in profusion. The pres- 

 ence of this mineral has had the effect of delineating in sharp 

 lines the fitfulness of current action, furnishing some striking 

 examples of this kind, and at the same time demonstrating 

 the sedimentary origin of the beds. This is a feature which 

 strongly differentiates the newer series from the older. 



The presence of rounded pebbles in the grits accords 

 with what is found in connection with these beds elsewhere 

 At the Grey Spur and at Forest Range the beds are char- 

 acteristic conglomerates, whilst in other places the included 

 pebbles are scattered irregularly through the matrix. This is 

 the case with the Barossa beds. For a mile or more of out- 

 crop these rounded stones arle plentiful, but distributed 

 singly rather than in layers or groups, and do not reveal the 

 sorting action of water that is usual with clastic deposits. The 

 stones, are worn to a very high degree, being in nearly every 

 case almost round, but there is no evidence of strong-cur- 

 rent action in their transportation, as they are set in undis- 

 turbed finer material. The j^ebbles appear to consist of only 

 two kinds: quartz, and a very fine-grained, siliceous quartz- 

 ite, the sizes ranging up to ten inches or a foot : stones of 

 3 to 5 in. in diameter are very common. It is not eas}- to ex- 

 plain their occurrence under the conditions in which they are 

 found. The beds give no evidence of ice action, as the bed- 

 ding is undisturbed, and there is no indication of morninic 



