251 



Geological Section 2. 



Formation indicated by 12 Bores, in line, at 300 yards' interval. 

 One Bore is 150 yards from next closest Bore. Vertical thickness 

 exaggerated nine times. Surface configuration according to 



Survey. 



r_- _ - _ -j Over- Buhos 



CoAL-Sesits 



!e.o- Rock. 



The following table supplies particulars of Bores A, B, 

 and C in respect to over-burden, thickness of coal series, 

 and depth at which bed rock was struck : — 



Bore A. BoreB. Bore C. 



Over-burden 67i ft. 12| ft. 35 ft. 



Coal series 33 ft. — 10 ft. 



Bed rock at 100£ ft. 12£ ft. 45 ft. 



From the preceding table it will be seen: — (1) The coal 

 series occur in shallow basins; (2) a rapid variation in the 

 thickness of the coal series ; (3) old surface topography deter- 

 mines the coal basin occurrences. 



From the log of Bore A, which is typical of 93 other 

 bores over the area, we find that seven distinct lithological 

 characteristics are encountered in regular order from the sur- 

 face downwards : — 



vii. Surface sand and travertine, 

 vi. Greenish and yellowish clays in which a greenish 



sand containing sharks' teeth occurs as a distinctive 



zone. Fossiliferous limestones, 

 v. Carbonaceous shales, 

 iv. Hard grey fossiliferous limestone with pyrites and 



quartz pebbles, 

 iii. Carbonaceous shales with appreciable amounts pf 



iron sulphides, 

 ii. Brown coal series, 

 i. Rotten talcose slates, bed rock. 



In places the bores have penetrated for some distance — 

 in one place 52 ft. — into the old rock underlying the form- 

 ations in which the coal series occur. Generally speaking, 

 this old rock has been found to be a pipe-clay, if overlain 

 by carbonaceous beds of any thickness. If the carbonaceous 

 i2 



