298 



GEOLOGT AND PETROLOGY OF THE GREAT SERPEXTIXE BELT OF X.S.W. 



oiive-gi'een nuulstones about sixty feet in thickness overlain by a tliiu tuflfaceous 

 conglomerate containing Rhacopteris intermedia and E. racmerif (probably tha 

 equivalent of the Rhacopteris beds by Proctor's homestead) . TJiese are followed 

 by the Main Felspathic Grit. The main "varve" zone and the olive-green mud- 

 stones are weak structures compared with the tillites below and the g^its above, 

 and their extension for some miles to the north is indicated by the manner in 

 which the heads of creeks open out into strike valleys following the base of the 

 ^lain Felspathic Grit In the three jireeeding traverses across steep slopes only 

 broad subdivisions of the Lower Glacial Series have been traced. The exposures 

 in Currabubula Creek, where it passes through the township, indicate that in 

 reality the succession of beds is more complex. The section from the point where 

 the Creek is crossed by the Duri Road to that where it is joined by Anstey's Creek 



Text-fig. 4. Contorted "varve-rock" in Browne's Creek. 



Text-fig. 5. A rounded granite houlder in 

 "varve-rock," Browne's Creek. 



Text-fig. 6. Subangular granite 

 boulders in contorted "varve- 

 rock," Browne's Creek. 



merits detailed study. Commencing the section is a thick band of conglomerate 

 followed by banded mudstone 40 ft., tillite 10 ft. (including a granite-erratic 

 three feet in diameter), well bedded felspathic tuff 30 ft., tillite 10 ft., contoi-ted 

 '•varve"-like felspathic tuff 50 ft., tillite 30 ft., followed by thii-k conglomerate 

 extending to the bond where Kocky Creek enters. Here the section is broken by 

 a zone of crushing probably denoting a fault. There follows banded contorted 

 "varve" rock 60 f t , containing many small erratics; this must be considered to be 

 the main "varve" zone. It is overlain by laminated olive-green mudstones, and 



