CARBONIFEROUS AND PERMO-CARBONIFEROUS ROCKS, N.S.W. 333 



the main glacial horizon of the Lower Hunter to be at the 

 base of the Pre-Greta Marine Series, and therefore to be 

 Uraiian, and, as seems probable, to be the equivalent of 

 the Irwin River tillite, which is also probably Uraiian. 



(iii.) Or in accordance with Professor J. W. Gregory's 1 

 suggestion, is the whole of the Lower Marine, Greta Goal 

 Measures and Upper Marine Series of New South Wales of 

 Upper Carboniferous (Uraiian) age, thus filling in the gap 

 between the top of the Kuttung and the base of the Permian, 

 the latter, according to Professor Gregory, beginning at 

 the base of the Tomago Coal measures? This would be a 

 very simple solution of the difficulty, but on the palseonto- 

 logical grounds, already given, we cannot accept it. 



(iv.) Or does the Rhacopteris flora of the Kuttung range 

 in New South Wales upwards into the Upper Carboniferous, 

 and does the Kuttung, as we have defined it, include Upper 

 Carboniferous as well as Middle Carboniferous forms, and 

 thus are the Upper beds of the Kuttung though mostly 

 barren of coal, the equivalents of the Pennsylvanian, 

 Stephanian, Ottweiler coal measures, so that the latest 

 Rhacopteris Flora of New Soutli Wales survived into the 

 time of the Neuropteris Flora of the Northern Hemisphere. 

 Certainly Rhacopteris was a hardy form which survived 

 the intense tuff showers of the Kuttung series, as well as 

 the earlier glacial conditions. 



11. Where so much is uncertain and unproved we can at 

 any rate rest assured that in the Australian region there 

 is evidence in the Newer Palaeozoic rocks of at least three, 

 if not four important glaciations, as follows: — (See Plate 

 XXIX, Section 1.) 



Permian Bolwarra Conglomerate and Branxton Bed& 

 Glaciation (Post-Greta). Time interval between Bolwarra 



1 Brit. Assoc. Adv. Sci. Report of Research Committee, Section C. 



