BY A. B. WALKOM. 133 



apparently does not deteriorate readily on exposure, as the shaft 

 had been made over two years at the time of my visit, and the 

 coal, which had been lying about for that time, showed only a 

 slight amount of surface-discolouration; and when broken open, 

 was as bright and hard as coal freshly taken out. About 75 

 yards up the creek, there is an outcrop of another seam, but the 

 water was too high for me to see it. However, Mr. R. Thomas, 

 Jr., informed me that he had got specimens of coal in situ at 

 that point, when the creek had been drier. At the point in the 

 creek where this outcrop occurs, the boulders in the creek-bed 

 are all coated black, and there is a very strong smell of H 2 8. 



Plate viii. is a series of comparative vertical sections of the 

 various seams just described. On comparison with section No. 

 x,* accompanying Professor David's Memoir, there seems little 

 doubt but that the top seam, in each case, represents the upper 

 split in the main Greta seam. This is further confirmed by the 

 presence of pyrites, which is indicated in these seams. The lower 

 split of the main Greta seam appears to have become further 

 split between Kothbury Creek and Black Creek, and a bed of 

 conglomerate and sandstone, some 60 feet thick, is developed 

 between the two parts. The 14 feet, 4i inches seam at the 

 Kothbury Colliery, and the 11 feet, 0^ inch seam at Black Creek, 

 represent the top part of this lower split; and the lowest seams at 

 Kothbury Colliery represent minor splits of the bottom-part of 

 the lower split. The 21 feet seam at Kothbury Creek probably 

 represents the whole of the lower split of the main Greta seam. 



Summary of Greta Coal-Measures in this district. 



The main Greta seam, or part of it, has been prospected in 

 four places, and the seam is split as at other localities. 



In each of the four localities, the upper split of the main 

 Greta seam has been struck. 



The lower split seems to be entire at Rothbury Creek, but 

 splits further to the north. 



* Section No.x is a comparative series of vertical sections of the Greta 

 coal-seams. 



