ABSTRACT OF PROCEEDINGS. XXXlll. 



the Tamworth Middle Devonian Series. The section from Bulliac 

 onward, shows features identical with those in the middle and 

 lower parts of the Tamworth Series as exhibited in the Tamworth 

 District. The rocks consist chiefly of coarse to medium grained 

 breccias and tuffs, associated with a small amount of banded 

 radiolarian claystone, which near Bulliac occur in masses from 

 thirty to a hundred feet thick, but are much thicker further to 

 the N.E. Excellent instances of intrusive tuff are visible, the 

 clearest example being about a mile from Bulliac. About four 

 miles further to the N.E. a small mass of intrusive albitised 

 dolerite occurs. The dip of the claystone near Bulliac is W. 40° S. at 

 65°, which follows about the average strike (from memory), further 

 to the N.E. the dip is often steeper, and rarely reversed, the strike 

 also fluctuates somewhat. This must be a region of frequent 

 strike faulting, traces of which can be seen in the cuttings. 



After a considerable thickness of claystone, pillow lavas appear 

 about a quarter of a mile west of Bundook, apparently running 

 back to the confluence of the Barrington and Manning Rivers, 

 and continue for the next two miles along the railway. They are 

 extremely decomposed at first, the pillow outlines appearing but 

 faintly, but east of Bundook Station the structure is more obvious, 

 and in the short deep cutting immediately beyond Baker's Creek, 

 they are very dense, hard, fresh-looking rocks, which are subvari- 

 olitic spilites, with well preserved pyroxenes, but albitic felspars. 

 A very striking feature in these rocks is the very great amount of 

 alteration they have undergone, the occurrence of bands of shatter- 

 ing, with abundant introduction of quartz and of epidote. Vesi- 

 cules are not very abundant. 



This last spur of spilite is the north-western extremity of the 

 Kangat Range. Kangat itself is over 2,000 feet in height, and 

 very steep, densely covered with brush, and is exclusively com- 

 posed of very massive pillow lavas, the ellipsoidal partings being- 

 traceable on the crags exposed every here and there, particularly 

 on the southern slope. Only rare and narrow zones of radiolarian 

 chert intercalated (by faulting 1) in the igneous rocks break their 



U— December 6. 1916. 



