CARBONIFEROUS AND PERMO-CARBONIFEROUS ROCKS, N.S.W. 287 



South Wales are incomplete portions of fronds, and it is not 

 always easy to distinguish in such cases between Cardiop- 

 teris and such genera as Neuropteridium. Hence at present 

 these specimens do not help much as regards the age of 

 the beds. 



Specimens such as those referred to Rhacophyllum are 

 not at all uncommon in rocks of Carboniferous age, and 

 afford no guide for correlation. 



The general facies of this flora, apart from comparisons 

 of individual species, seems to indicate that it is equivalent 

 to floras which are known from the lower portion of the 

 Westphalian (Middle Carboniferous). The horizon of the 

 Kuttung Series then would be approximately that of the 

 Millstone Grit of England, the Ostrau-Waldenburg Basin 

 of Silesia, the Sinork Coal of the Heraclean Basin (Asia 

 Minor) and the Upper Pottsville and Lower Kanawha 

 Series of U.S.A. From the present knowledge of the flora 

 it does not appear possible to say how high up in the Middle 

 Carboniferous the Kuttung Series may be extended. 



Appendix II. 



Petrological Notes on the Carboniferous Igneous Rocks, 

 by W. R. Browne, b.Sc 



The following notes, which are the result of a brief petro- 

 graphical study of representative volcanic rocks from the 

 localities whose geology is dealt with in this paper, must 

 be considered incomplete in view of the fact that the rocks 

 are almost all porphyritic, the groundmass being either 

 felsitic or even mostly glassy at times. In such circum- 

 stances the true relationships can only be determined 

 when petrographical is supplemented by chemical study, 

 and the present classification and nomenclature must 

 therefore be regarded as tentative and liable to subsequent 

 modification. It should be mentioned also that no great 



