22 



The first or eastern shaft is 90 feet deep, and passes: 

 through the following strata: — 



Thinly-bedded sandstones and shales 16 



Brownish sandstone 18 6 



Shale 4 



Thinly-bedded sandstones and shales 20 



Sandstone 2 6 



Shale 11 



Sandstone _ 3 



Thinly-bedded sandstones and blackish arena- 

 ceous shales 23 1 



Coal 2 



60 



Total 



Sandstone. 



There are numerous curious " jumps " or minor disloca- 

 tions between the east and west shaft, which latter are 200 

 yards apart. These faults cause an upthrow and downthrow 

 alternately of about 2 feet ; that is about the thickness of the 

 seam. To the west of the last or west shaft there is an 

 important fault, throwing up the coal 32 feet. 



The direction of this important fault is very irregular. It 

 appears to have a north and south trend with its underfoot to 

 the east. 



West Shaft. 



The section of the west shaft which 

 follows : — 



Sandstone 



Shale and sandstone... 



Shale 



Sandstone 



Sandstone and Shale .. . 



Coal ,. 



being worked 



15 



20 



3 



2 



29 



2 



is as 



73 



Sandstone. 



The coal measure basin is of limited extent, following the 

 lower levels between the greenstone ridges, and following in 

 the direction of the South-western Coast. If we consider the 

 dip to be continuous for the two miles over which the beds 

 are exposed, it is probable that the whole formation does not 

 exceed 800 feet in total thickness. Some of the members 

 appear to contain fair sandstones for building purposes. 



One Tree Point. 



An interesting section of the marine mudstones is exposed 

 at One Tree Point, North Bruni, in cliffs varying from 70 to 

 300 feet in height. 



The beds dip as usual to the west, and are for the most 

 part composed of regular thin layers of grits, conglomerate, 



