GEOLOGY OF THE GLOUCESTER DISTKICT N.S.W. 235 



made was contributed to the proceedings of the Geological 

 Section of the Royal Society of New South Wales. 1 Since 

 then, the author has made a number of short field trips to 

 the Gloucester District, mainly for the purpose of working 

 out the succession and thickness of the Carboniferous 

 strata, and their stratigraphical relationship with the 

 underlying Devonian strata. Time did not allow of the 

 making of an accurate detailed geological map, and in the 

 one which accompanies this paper, the boundaries of the 

 various geological formations shown are only approxima- 

 tions. They are, however, sufficiently accurate to reveal 

 the general geological structure of the district. I have to 

 thank Messrs. V. B. Collins, A. F. Newman, and W. Clark 

 for much help in carrying out the field work ; and my thanks 

 are due to Mr. W. G. Stone for having kindly made the 

 analyses of the igneous rocks. I have also to thank Prof. 

 Sir Edgeworth David for much kindly advice, when he 

 accompanied me on one of my visits to the district. 



Physiography. 

 The most striking physiographical feature of the district 

 adjoining the town of Gloucester is a majestic group of 

 rocky hills, with precipitous faces, lying to the west of the 

 town, and known as the The Gloucester Buckets. These 

 are made up of Carboniferous lava flows, now tilted on end. 

 Almost equally conspicuous is another rocky range of hills 

 lying to the east of the town, and known as the Mograni 

 Mountain. This, in its geological structure, is similar to 

 the Gloucester Buckets. 



The North Coast Railway, from Craven to Gloucester, 

 traverses a relatively low region 300 to 400 feet in altitude, 

 a region about five miles wide and twelve miles long, in 

 a north and south direction. This region has a gently 



1 This Journal, Vol. xlxix, 1915, Abstract of the Proceedings of the 

 Geological Section, p. xxvii. 



