BY W. N. BENSON, 



501 



component rock-fragments, and broken mineral-grains are strik- 

 ingly similar to those of the Tamworth breccia. They are inter- 

 stratified with similar spilite-flows, and, in several instances, are 

 interbedded with fine radiolarian chert ,and tuff, almost indistin- 

 guishable from the rocks that predominate in the Tamworth Beds. 

 Further, the Barraba Beds, which lie conformably on the Baldwin 

 Beds, exemplify perfectly this lithological criterion of conformity, 

 for they contain interstratified bands of coarse, tuffaceous agglo- 

 merate or breccia, quite analogous to that of the Baldwin agglo- 

 merate, though not quite so coarse. There is, thus, a complete 

 conformity during oscillatory change of conditions, from the Tam- 

 worth Series through the Baldwin Beds to the Barraba Series 



Conglomerates with 

 RVwjoliteft flnde&ites %t. 



fW$t<Me*£imeM-cmf 



fludsVone with Hadiolarw 



PgolomeraVe^ Coarse 

 Brecuo «»f3\)'i\ire flottt 



Finer &recao,Tu 

 Ajjilire Flow?, Cftra 1 



s 



Li*\es>fcmt Radiolarian 

 Clft^tone «c chert 



Condilioro 



\ Pefc 



Lower BUI* Oh' |U rr «r IIP 



Lower Garbonifersui 



Fig.2. 



(text-fig. 2). In the Nundle region, the Baldwin Agglomerates are 

 absent, or represented by a thin band merely, of rather coarse 

 breccia; and, above and below this, the Bowling Alley and Nundle 

 Series lie in perfect conformity with each other. These two Series 

 are identical with the Tamworth and Barraba Beds further north. 

 There seems, then, sufficient grounds for dissenting from the inter- 

 pretation put on the Tamworth junctions by Messrs. David and 

 Pittman. It should be noted that their conclusion was not a very 

 definite statement, for in the concluding remarks they say, "If the 

 one bed of conglomerate observed near Tamworth be not referable 

 to the Radiolarian series, as appears probable, the whole of the 

 strata are remarkably fine-grained. . . ." 



