74 VOLCANIC AREA OF EAST MORETON, ETC., DISTRICTS, Q., 



Part i. Physiography and Topography 

 i. Introduction. 



In a previous paper* I have already discussed the geology of 

 the Glass House Mountains district. A visit to Queensland in 

 February and March last year inspired me with a strong wish to 

 continue the research, the interesting plutonic and metamorphic 

 rocks of the D'Aguilar Range and the wide assortment of volcanic 

 rocks in the Maroochy River district having specially attracted 

 my attention and aroused my interest. 



The present paper deals with an area extending from Cooran 

 near Gympie to North Pine, 14 miles from Brisbane, and from 

 the coast inland to the beds of the Mary and Stanley Rivers, 

 covering in all more than 1,000 square miles. More than five 

 months have been devoted to field work. The result appears on 

 the Plan (Plate v.). 



Dense scrubs, the talus slopes obscuring cliff exposures, large 

 swamps, and the dearth of cuttings, quarries, mine-shafts or bores 

 in the district, not to speak of the unsettled nature of much of 

 the country and lack of means of communication, were serious 

 impediments to be overcome. 



No proper geological work has been done in the district since 

 the surveys of the late Hon. A. C. Gregory in 1875. The 

 " Geological Map of Queensland " published by the Queensland 

 Mines Department in 1899 is altogether too indefinite as far as 

 this region is concerned. 



ii. Physiography and Topography. 



(a) The Coastal Area.— As shown on the Plan (Plate v.) the 

 Trias-Jura rocks of the distinct form a coastal fringe, widest to 

 the west of Bribie Island and narrowing towards the north and 

 south. This belt belongs to the Ipswich Coal Measures, into 

 which it merges at Brisbane; northwards it is continuous as far 

 as Lake Cootharaba, except for occasional volcanic and intrusive 



* These Proceedings, 1903, p. 842. 



