BY W. N. BENSON. 327 



runs along tlie eastern foot of the P\n-amid Hill Range (the 

 ►Scrub Mountain conglomerate). This may be approximately 

 coeval with the Baldwin Agglomerates. 



3. The mudstone west of these may be correlated with the 

 Goonoo Goonoo or Barraba mudstones. 



4. That the great masses of agglomerate and tuff, being derived 

 from eruption at various centres, do not form continuous horizons 

 except in rare cases, and great care must be used in stratigraphi- 

 cal correlation based on the lithological features of pyroclast'ic 

 rocks. Hence arises the difficulty of determining the exact 

 horizon to which must be referred the Pyramid Hill group of 

 tuffs, etc., or of recognising definitely the horizon of the Baldwin 

 Agglomerates. 



5. The Moore Creek Limestone is not represented in the 

 2^undle District, but its appropriate horizon is probably not far 

 from the township of Nundle itself. 



6. TheLoomberah Limestone is represented by the two western 

 lenses of limestone near the head of Silver Gully, to which special 

 attention was called during the first survey of the Nundle 

 District(3, p.574). 



7. The main line of limestone which passed through to iiowling 

 Alley Point and continues to Hanging Rock, belongs to the 

 Xemingha or Lower Middle Devonian Limestone. 



iS. That the pyroclastic rocks which lie directly above the 

 spilites and dolerite of the Upper Bowling Alley Claystones 

 represent the " Igneous Zone'' of the Tamworth District. 



9. The Lower Bowling Alley Tuff-Breccias, Dolerites, etc., are 

 a repetition of the same " Igneous Zone "' and its associated 

 intrusive rocks. 



10. Much of the Middle Devonian (Tamworth) Series may bt' 

 recognised in an altered state in the regions east of the serpentine 

 in all three districts. 



The Eastern Series. 



In the Loomberah District, we will describe with the Eastern 



Series, not only all those rocks lying east of a line joining all the 



outcrops of serpentine, but the lithologically identical masses 



which lie to the west of that line, the rocks of the Transitional 



