BY w. \. r.RNSox. 237 



Xorth of this, Gouron Gouron Creek, which flows through 

 Upper Bingara, turns eastwards down through the Eastern 

 Series to the Keera 8enkungsfeld, just in time to prevent its 

 capture bj^ the liead of Barrack Creek. This flows to the north- 

 east, traversing the serpentine diagonally and exposing a section, 

 four miles long, of alternating massive and schistose serpentine, 

 standing out in rounded hillsides, or long crenellated ridges. 



The bridle-track northwards from Upper Bingara leads on to 

 the Eastern Series, passing the old Mount Everest copper-mine. 

 Four miles north, a gabbro mass occurs, similar to that at Upper 

 Bingara. At the northern end of this mass, some very interest- 

 ing types of altered gabbro, some almost completely changed to 

 garnet (rodingite), have been obtained (1, Pt. iii., p. 686). The 

 same structure prevails as to the south— a wide, open valley, 

 with its floor covered with gabbro-detritus, is enclosed between 

 jasper, etc., to the east, and a ridge of massive bastite-serpentine 

 to the west; while the western side of the ridge plunges steeply 

 down into Hall's Creek. On the eastern side of the gabbro is 

 some schistose serpentine, but with a fibrous rather than a 

 foliated structure. It contains auriferous calcite-quartz veins. 



In Spring Creek, near Bingara, the serpentine branches into 

 several "fingers" pointing northwards. The easternmost of these 

 is accompanied by gabbro stained by copper carbonates. Pro- 

 fessor David stated that the serpentine strongly invaded and 

 altered the limestone here (14); and, near the contact-line, there 

 is a large mass of pegmatitic albite like that near Crow Mountain 

 (1, Pt. iii., p. 691). Professor Judd has described veins of picotite 

 and massive green garnet, the latter traceable for over a mile 

 between Barrack Creek and the Gwydir(24). The former was 

 probably a segregation, and has not been rediscovered; the latter, 

 while analogous to the garnet-rock found by Porter at Ironbark 

 Creek and Bowling Alley Point (25), is probably portion of the 

 garnet-gabbro or rodingite mentioned above. Mr. Porter also 

 mentions the occurrence of filiform gold in calcite-veins in the 

 serpentine, in this neighbourhood. North of the Gwydir, the 

 serpentine is again seen as a small lens on the Bobby Whitlow 



18 



