BY A. B. WALKOM. 97 



Furtlier north, in the Gynipie district, rocks of similar a,ue are 

 also folded and metamorphosed to much the same extent as in 

 the districts just mentioned. 



A word of caution must be expressed here regarding the so- 

 called "Gympie" strata. The results of field work carried out by 

 the officers of the Queensland Geological Sui vey tend to show 

 that many rocks have, in the past, been referred to the Gympie 

 Series without sufficient evidence; these are gradually being 

 sorted out by the Geological Survey, and put in their proper 

 position: and they have been found to include representatives of 

 the Carboniferous and Devonian Systems, in additi<m to true 

 Permian (Permo-Carboniferous) strata. Care must be exercised, 

 therefore, when dealing witli rocks classed as Gympie. 



In the Gympie district, where undoubtedly Permian (Permo- 

 Carboniferous) sedimentaries are much altered, there are 

 granitic, intrusive masses whose age is not directly determin- 

 able. It seems a reasonable suggestion that they are of similar 

 age to the New England intrusions, and that they have been 

 responsible (at least in part) for the folded and altered condition 

 of the Gympie rocks. 



Further north and north-west in Queensland, the Permian 

 (Permo-Carboniferous) rocks [Bowen River coalfield, Dawson- 

 AJackenzie coalfield, etc.] appear to be normal, and not to have 

 suffered any considerable folding as the result of the intrusion of 

 large plutonic masses. 



In the distribution of the Permian (Permo-Carboniferous) 

 rocks of New South Wales and Queensland, then, there are to 

 be noted the following important points. Sediments of this age 

 are known from Southern New South Wales to Northern 

 Queensland; normally, these sediments are unaltered, and ap- 

 parently have not been subject to extreme folding-forces; in the 

 central part, however, (from New England to the Gympie dis- 

 trict) the intrusion of extensive, granitic masses has resulted in 

 extreme folding and metamorphism of sediments of this age, 

 which, as a result, resemble strata of much greater age than the 

 normal Permian (Permo-Carboniferous; strata of Eastern Aus- 

 tralia. 



