128 



GEOLOGY MAITLAND-BRANXTON DISTRICT, 



Exposure to the atmosphere gives a yellowish tinge to the 

 surface of the coal from this seam, and a small amount of sulphur 

 is deposited in the 



"funnel 



Conglomerate, roof 



Coat. 



Clayey slialc banj 



Coal 



Clayey sU* UnJ Circular) 



Coal 



Bar.d lirrtqulir) 

 Spiinf coal iyir. 



n1Vicli»r«i«ci-^»r) 



Coal 



in 



cracks. Although no 

 crystalline pyrites has 

 been observed, there is 

 probably a small per- 

 centage of it in the 

 coal; and this sulphur 

 has been set free during 

 the oxidation of the 

 pyrites to iron sulphate 

 (FeS0 4 ). This seam 

 has a floor of dark 

 shale, and then, for a 

 thickness of about 60 

 feet, the strata are 

 chiefly sandstones and a 

 massive conglomerate. 

 Then follows the best 

 seam of this locality. 

 Within a very short 

 distance (only a few 

 yards) of the outcrop, 

 the seam is 12 feet 6 

 inches thick; and, at 

 170 yards in, along the 

 tunnel, the seam has 

 thickened to 14 feet 

 4J inches, including 

 bands (see Fig. 5). 



The lower ten feet of this seam is being worked at the Hoth- 

 bury Colliery. The seam dips N.55°W. at 18^ °, and consists of 

 hard, semibituminous coal. 



Dark sUe fl< 



Uf4i Coal and bands 



Ficj 6 becfion of coal seam at Rothburv Collieries 



