110 PROCEEDINGS OF THE ROYAL SOCIETY OF QUEENSLAND. 



direction is north-south. The Cordillera in Victoria is formed 

 by the fusion of a number of north-south ranges, probably 

 through a general plateau uplift along an east-west axis. 



III. THE CORDILLERAN BELT. 



This area might be described as extending from Cape Howe 

 and Mount Kosciusko on the south, to the vicinity of ^Nlackay 

 in the north. Although comprising many stratigrapliical for- 

 mations, the region is a geological unit in that the direction of 

 folding is identical \A'ith the direction of mountain axes and 

 maximum elevation. 



Through this belt the earth movements have been of a 

 compressional type, true fold movements of the mountain- 

 building nature, right up to the Tertiary period, though in the 

 southern portion of the belt, the Hawkesbury sandstone of the 

 Shoalhaven and Sydney districts, is not greatly disturbed. 

 Further north, in the Clarence and IpsAvich districts, consider- 

 able fold movements were experienced aft«r Jurassic sedimen- 

 tation, and in the Ips\A'ich and Burrum districts even Tertiary 

 beds show some folding. The Mesozoic formations are, however, 

 dipping at very steep angles along a line from IpsAvich north- 

 north-west towards Mount Brisbane, and bent into an anti- 

 clinal fold in the D'Aguilar Range. Considerable rolls are 

 observed in the same beds in the More ton Ba}^ district. \AliLen 

 we get further north to the Maryborough district v,'e fuid the 

 still higher Upper Cretaceous rocks sharply folded. This is 

 also the case with the Styx River Cretaceo -Tertiary Coal 

 Measures, north of RockhamiDton. The Bunlamba and 

 Walloon formations are folded into a very sharp anticline 

 between Beaudesert and Boonah. 



All these fold movements are but repetitions of the same 

 impulses wliich gave origin to the belt of coastal elevation. 



Alkaline lavas also characterise parts of this belt at Gib 

 Rock, Mittagong, ]\Iount Ban-igan, the Warrumbungle and 

 Nandewar Mountains, the Canobolas, and the subalkaline erup- 

 tions of Prospect and Kiama, all in New South Wales. Also 

 the volcanic rocks of south-eastern Queensland, including those 

 of the oMcPherson Range, the Springbrook Plateau, the Main 

 Range, Mount Flinders and the Fassifem Peaks, the Eskliills, 

 the Glass House Mountains, the Yandina and Cooran heights, 



