262 C. A, SUSSMILCH AND T. W. E. DAVID. 



glomerate, while at Clarence Town the same formation 

 has a thickness of upwards of 2000 feet. The pebbles 

 average two to three inches in diameter, but may exceed 

 this size, individual pebbles ranging up to eighteen inches 

 in diameter being not uncommon. Most of the pebbles are 

 typically waterworn, but some occur which are sub-angular 

 and faceted with some suggestion of having been derived 

 from glacial material; no striated pebbles have, however, 

 yet been obtained from this horizon. A great variety of 

 rocks is represented in this conglomerate, including granites 

 (of various kinds), quartz porphyry, felspar porphyry, quart- 

 zite, chert, etc. 



Good exposures of this formation may be seen (a) in the 

 railway cutting immediately to the east of the Wallarobba 

 Tunnel [Plate XX], (b) the road cuttings immediately to 

 the west of Clarence Town on the road from thence to 

 Dungog, (c) immediately to the east of the Dungog railway 

 tunnel. 



The Tuffaceous Beds. — Towards the top of this formation 

 the conglomerates gradually give place to tuffs, tuffaceous 

 shales and tuffaceous sandstone, with occasional bands of 

 conglomerate, there being a considerable thickness of these 

 tuffaceous beds. At Wallarobba the thickness is about 

 500 to 550 feet, while at Clarence Town it is probably 

 much greater. These beds possess no features of special 

 interest and gave poor outcrops. 



The Martin's Creek Beds. — Although volcanic material 

 occurs more or less throughout the Kuttung Series, this 

 particular part of it consists almost entirely of volcanic 

 material, including both lavas and tuffs. This volcanic 

 belt persists throughout the district extending from the 

 coast at Port Stephens to the Williams River District where 

 it outcrops in the Mount Gilmore Range, it extends thence 

 westward to the Paterson River Valley at Martin's Creek, 



