GEOLOGY OF THE GLOUCESTER DISTRICT, N.S.W. 237 



aS other features, all suggest that the mainstream channels 

 ante-date the present topography, i.e., they are revived 

 streams. 



Some twenty miles to the west of the region here being 

 described lies the Barrington Tableland, 4,000 to 4,500 feet 

 in altitude, its eastern margin being marked by a great 

 fault escarpment. Its surface is part of the same peneplain 

 as that which occurs in the Gloucester District, the two 

 regions being elevated during the same uplift, but while 

 the Gloucester region was uplifted only about 2,000 feet, 

 the region to the west was uplifted 4,500 feet; and the 

 stresses set up as a result of this unequal movement, 

 developed the line (or lines) of faulting which mark the 

 eastern face of the Barrington Tableland. 



Geological Formations. 

 The geological formations represented in the Gloucester 

 District are as follows: — 



Post Tertiary Alluvial Deposits 



Permo-Carboniferous Gloucester Coal Measures (? Upper Coal Measures) 



fThe Kuttung Series j Lava flows, conglomerates 



I I mud stones, and tuffs. 



Carboniferous <J ( Conglomerates, shales, 



| The Burindi Series } limestones, tuffs, and 



t ( lava flows. 



f , Banded shales, mudstones, 



The Barraba Series \ limestones, and tuffs, 



| j with Radiolaria and 



Devonian <| ' Lepidodendron australe. 



( Banded radiolarian cherts 



| The Tamworth Series ■! intrusive tuffs, and 



t ( spillite lavas. 



A. The Devonian System. 

 Upon reference to the accompanying map it will be seen 

 that Devonian strata outcrop extensively over the northern 

 and western parts of the area shown. Excellent exposures 

 may be seen in the cuttings along the railway line from 

 Gloucester to the Manning River, starting at a point about 

 one and a quarter miles from the Gloucester Railway 

 Station. The strata in the hills around Copeland are also 



