604 president's address. 



AiistraUs, McCoy, and Lepidodendron ausfrale, McCoy. Both of 

 those plants are also found associated with a marine fauna, 

 Productiis cora, Protoretepora aiwpla^ Martinia subradiata, in the 

 Iguana Creek Series of Victoria, which may be homotaxial with 

 the Gympie Series. Interstratified tuffs and lavas occur in the 

 Gympie Series at Gympie, and also in the Iguana Creek Series as 

 developed on the Avon River in Victoria. In the Hodgkinson 

 Goldfield, in Queensland, the Gympie Series is 20,000 feet thick. 



No Lepidodendron is as yet known to have been found in the 

 Gympie in New South Wales. 



Tlie Gympie rocks have been strongly folded along the 

 Kosciusko Axis, which at the close of the Gympie epoch appears 

 to have extended itself across the New England District of the 

 northern portion of New South Wales, and into Queensland at 

 least as far north as the Palmer Goldfield. The folding took 

 place chiefly before the close of the Carboniferous Period, as the 

 Star Series, which overlies the Gympie, is far less folded than the 

 latter. The folds strike N.N.VV. chiefly, in New England, N. and 

 S. in the type district at Gympie, and N.N.W. to N.W. in 

 Central and Northern Queensland. Mr. Jack considers that the 

 folding of the Gympie was the chief factor in the evolution of the 

 Main Dividing Range of Queensland, as it certainly was in that 

 of the New England District of New South Wales. At the close 

 of the Gympie epoch the Main Dividing Range of Eastern Aus- 

 tralia probabl}^ occupied approximately its present position, but 

 was situated further west in New South Wales than it is at 

 present and probably was much higher. In the next formation, 

 the Star, there is evidence of an abundant land flora, compri.sing 

 L. veltheimianum in Queensland, in addition to L. australe, 

 Oyclostigma Australicum, Calamites varians, Gordaites Australis, 

 McCoy, and Stigmaria (?), Tenison-Woods. A similar flora occurs 

 in New South Wales, but in addition the fern Rhacopteris is very 

 abundant, especially in the Hunter District. The same fern 

 occurs in similar strata in Victoria. It is abundantly associated 

 with Lepidodendron veltheimianum in the Stroud District of 

 New South Wales. 



