BY A. B. WALKOM. 



127 



are overlain by a series of a little over 300 feet of brownish 

 sandstones, which are followed by the Greta Coal-Measures. 



The Greta Coal-Measukes. 



Professor David mapped the outcrop of these Measures, and 

 gave numerous detailed sections of the coal-seams developed at 

 many points along the outcrop. At the time of publication of 

 his work,* however, very little information was obtainable about 

 the development between Branxton and Pokolbin.f Since that 

 time, a new colliery (the Rothbury Colliery) has been opened, 



and the coal prospected at 

 three other points along the 

 outcrop on Rothbury Estate. 

 To the manager of this col- 

 liery, Mr. Richard Thomas, 

 Jr., I am indebted for most 

 of the information contained 

 in this section. The four 

 separate points at which sec- 

 tions of the seams have been 

 measured are : 



(1.) Rothbury Colliery (on 

 portion 26, Parish of Branx- 

 ton). 



(2.) Where the outcrop 

 crosses Black Creek. 



Conglomerate 

 Coal 



Cla^ band 



Coal 



Dark shale floor 



n> Sect, 



7|3j Coal and Bands 

 on of Upper Seam at Rothbury Collieries 



(3.) In portion 17, Parish of Rothbury. 



(4.) Where the outcrop crosses Rothbury Creek. 



(1.) Rothbury Colliery. — As seen from Plate viii.. the most 

 complete section has been obtained at this point. Underneath a 

 solid conglomerate-roof, there is a 7 feet 3 inches seam (see 

 Fig.4). 



* Mem. Geol. Survey N. S. Wales, Geology, No.4, 1907. 

 t Op. cit., pp. 138-140. 



