BY W. X. BENSOX. 23 1 



cupriferous pyrites and hornite in jasper and phyllite, invaded 

 by masses of serpentine and veins of quartz. The whole ore-body 

 dips steeply to the east, and gives evidences of considerable 

 faulting and pressure. 



Following down Gulf Creek to the north-east of the mine, the 

 jaspers of the eastern series are banded and more like the cherts 

 of TamA\orth. They contain abundant radiolarian casts. The 

 dip is steep to the east, but rather contorted. The creek falls 

 rapidly, breaking into cascades over resistant bars of quartz. 

 Between two and three miles from the mine, the slope gives 

 place to a Hat step about a mile wide. Here a large amount of 

 spilite occurs together with intrusive dolerite, while bedded chert 

 and tutf with limestone-fragments (the Nemingha horizon ?) are 

 also present (in Portion 17, Parish Capel). From here, the 

 stream plunges over a bar of red jasper into the narrow gorge 

 known as "The Gulf," from which it issues on to the floor of 

 Keera Senkungsfeld. 



The jaspers and phyllites of the Eastern Zone have been fol- 

 lowed all the way from Gulf Creek to Bingara, and form a con- 

 tinuous ridge beside the serpentine. Near Upper Bingara, 

 Anderson noted the occurrence of a small mass of basalt o\ er- 

 lying Tertiary drift on this ridge (19). Gouron Goiiron Creek, 

 after flowing through a mature upper valley on the gabbros, 

 strikes north at Upper Bingara through the Eastern Series, pass- 

 ing down through a great gorge opening on to the Keera 

 Senkungsfeld. Further north, Borah Creek has a similar 

 course. Near the point where it leaves the serpentine, is a mass 

 of porphyritic spilite described previously (1, Pt. iii., p.665), and 

 adjacent thereto, in a disused mine-shaft by the 5-Mile Peg on 

 the Upper Bingara Bridle Track, is a strongly chloritic tutf and 

 a \ ery sodic albite-dolerite, of which an analysis has been given 

 (ibid., pp.667 and 704). 



Following down this track, one passes the occurrence of 

 cinnabar described by Professor David (14). Here the serpentine 

 opens out into several northward-pointing fingers, between which, 

 the rocks, which seem to be almost entirely Middle Devonian, 



