BY W. N. BENSON. 



495 



to the east came up along the many fault-planes in the shattered 

 eastern block, while the few intrusions of peridotite, west of the 

 main line, have been proved to lie in subsidiary fault-planes, such 

 as would be expected to occur here and there by the main great 

 overthrust. 



The sedimentary formations developed prior to the folding may 

 be classified as follows : — 



Formation. 



(/. ) Rocky Creek Conglomerates ■* 



(e.)Burindi Mudstones ) 



(d.) Barraba or Nundle Series 



(c.) Baldwin Agglomerates 



(fo.) Tamworth or Bowling Alley Series... 

 (a.) Woolomin Series 



Age. 



Lower 

 Carboniferous 



[Upper Devonian .. 

 Do. do. 



Middle Devonian . 



Lower Devonian(!) 



Maximum 

 Thickness. 



f 2,000ft. + 

 I 1,500ft. 

 13,000 ft. + 

 3,000 ft. + 

 10,000 ft. + 

 Unkuown. 



These are all apparent thicknesses. It has been impossible, as 

 yet, to determine how far they may have been increased by strike- 

 faulting, which is undoubtedly present. 



A brief description of these may now be given. 



ws.w. 



E.N£. 



Fig. la. —Generalised Section, Northern Type, about 30 miles long. 



W.5.W. 



a] e 



Fig. 16. — Southern Type, about 20 miles long. 



1. Woolomin Series. 5. Burindi Mudstone. 



2. TamwortrTSeries. 6. Rocky Creek Conglomerate. 



3. Baldwin Agglomerate. 7. Serpentine. 



4. Barraba Mudstone. 8. Granite. 



