BY H. I. JENSEN. 105 



may prove to have been captured from the Maroochy River 

 (obsequent). The Stanley River on the Woodford peneplain 

 ■flows over hard granitic rocks in a shallow bed. It is a recent 

 stream developed by stream capture, aided by the uplift referred 

 to. Evidently the large Brisbane River, flowing mainly through 

 soft Trias-Jura strata, had an advantage over other streams that 

 had to cross a barrier of hard rocks to reach the sea. 



As other evidences of recent elevation the raised beach at 

 Point Arkwright deserves special mention. It indicates an uplift 

 of at least 150 feet. The drying up of the coastal swamps, and 

 their gradual conversion into good grazing lands have been 

 observed by many residents of the Moreton and Wide Bay 

 districts, as well as by myself. 



Other pieces of evidence in this connection were given in my 

 former paper on the Glass House Mountains.* 



v. Conclusion. 



'From the foregoing it is seen the district under discussion is 

 one of interest from many points of view, in its variety of rocks, 

 its stream development, and its land forms. The following 

 conclusions are offered : — 



(1). The D'Aguilar and Blackall Ranges are formed essentially 

 by folding, anticlinal south of Mt. Mee, for the rest monoclinal. 



(2). The Glass House Mountains are volcanic, and are situated 

 on systems of intersecting cracks. 



(3). A true peneplain of Tertiary age existed behind the 

 present coastal range at Woodford; and great changes in 

 drainage have taken place throughout the district. 



(4). All the coastal area has from time to time been submerged 

 in the Tertiary period, and the subsequent re-elevation is still 

 going on; the Maroochy and Noosa districts form clearly a plain 

 of marine erosion, and at Cooran we have a recently elevated 

 peneplain. 



(5). The Ipswich and Burrum Coal Measures are not separated 

 by a peninsula of older Gympie rock, but are continuous. 



* These Proceedings, 1903, p.842. 



