BY W. N. HRNSON. 24^ 



20° E., and its northern extremity is invaded by the serpentine. 

 Adjacent to the limestone to the south, are other rocks of the 

 Tarn worth type dipping E.li5°8. at about 85°, namely banded 

 claystone richly radiolarian, and coarse tuff, and, in the creek, is 

 a boulder of a vesicular rock like spilite. 



For the rest of the way northwards along the eastern side of 

 the valley, there are scarcely any go(jd outcrops. There can he 

 little doubt that the majority of the rock is of Tamworth age, 

 and, as been already described, the limestone appears again 

 about three miles south of Bingara, and passes across the Ser- 

 pentine Line into the Eastern Series, fossiliferous patches lying 

 among the long fingers of serpentine. The western side of the 

 valley will be discussed later (pp. 26 1-262). 



One feature remains for mention. Ruby Hill, 12 miles south 

 of Bingara, is a slight (elevation in the valley-bottom, composed 

 of volcanic breccia, cut by basalt-dykes. This is noteworthj^ as 

 containing numerous garnets, surrounded by kelyphitic rings, 

 and fragments of eclogite. The geology of this has been studied 

 by Mr. Pittman(27), while the petrology was described very com- 

 pletely by Mr. Card (28). The reported occurrence of diamonds 

 in the breccia has not been confirmed. (See also 25, 26). 



Adjacent to this, there is an intrusion of felsite or micro- 

 granite into the surrounding claystones. 



Only brief studies have been made of. this zone north of 

 Bingara. As has been seen, the limestone, which was east of 

 the serpentine on Myall Creek, crossed once more to the west, 

 two miles further to the north. It is very noticeable as a broad 

 mass of crystalline, white and pink marble on Hamilton's pro- 

 perty at Oakey Creek, five miles south of Kelly's Gully; and 

 here strongly resembles the Nemingha limestone near Black 

 Jack by Woolomin(l, Pt. ii., p.574). 



About 100 yards west of this is a scarcely altered bar of grey 

 oolitic limestone, which is probably part of a band of Burindi 

 rocks nipped in on the folding. Another similar bar occurs by 

 the roadside a mile north-west of here, and both closely resemble 

 the typical crinoidal and oolitic limestones near Caroda on the 



