42 T. W. E. DAVID. 



Divide has been let down below sea-level. Thus only a few 

 miles of the heads of the eastern rivers have been preserved. 

 As the result of this extreme betr unking they have become 

 greatly overhung above the foundered area. Hence the 

 steep-to coast and high waterfalls. The theoretical struc- 

 ture of this part of Queensland, near Cairns, is shown on 

 Fig. 8. 



SECTIONS across QUEENSLAND. 

 Rg.8. 



Main Divide Foundered and fractured Ease slope 

 V. Chillagoe IVtfBar.HeFrere of the Old Divide E. 



iulf of Devonian 5158 P Cairns 



amenfaria <ni,,rian'< D^aii- '■ > Holmes Reef 



Crer a cJs Una "\_^J^C\ : Xf Bamer : WaneReef 



I Keet ■ ... Sea Level 



Granite 500 --Granite - miles- - Carbon/ ferous > 



As regards unit (1) the Main Divide, an examination of 

 the geological map of Queensland shows that it is formed 

 largely of granites, and so-called Gympie rocks 1 which may 

 be more appropriately termed the Star Series. These differ 

 from the true Permo-Carboniferous rocks in containing 

 Lepidodendron and Aneimites, allied to Rhacopteris, as 

 contrasted with the Glossopteris-Gangamopteris Flora of 

 the Permo-Oarboniferous System. West of Townsville the 

 Middle Devonian rocks of the Burdekin System form part 

 of the Divide, and near Ohillagoe Mr. B,. Etheridge 2 has 

 recorded Haly sites from Silurian rocks. Probably older 

 rocks of slates, schists, quartzites, etc., extend from 

 Springsure to near Townsville, and from west of Oanoona 

 in the Rockhampton District in the direction of Bowen. 



1 As the Gympie Rocks in the type district now prove to be Permo- 

 Carboniferous, in the meaning of that term as used by New South Wales 

 geologists, it is no longer an appropriate term for the Lepidodendron 

 Beds of the older (Carboniferous or possibly Upper Devonian) formations. 

 The term Star Series will be used in this address for the latter. 



2 Geol. Sur. Queensland, Publication No. 190. Records No. 1, viii, pp. 

 30-32. 



