159 



friable, is of very fair quality. In working eastward from 

 the middle shaft there is a curious sign of disturbance, which 

 has bent the seam suddenly into a sharp rounded saddle, and 

 although the continuity of the seam was unbroken, the coal 

 was very much crushed at the sharpest parts of the flexure. 

 It is evident from this that the coal measures have been 

 subject to violent pressure laterally since their deposition. 

 It is impossible to say whether this force was associated with 

 the outbursts of the earlier greenstones or with the later 

 Tertiary basalts, which are also of great extent in the neigh- 

 bourhood of Evandale and Breadalbane. 



The following particulars relating to sections of shafts at 

 Norwich have been supplied to me by Mr. Brain : — 



EAST END SHAFT (MASON's). 



Common yellow clay 



Brown coaly shale 



Yellowish or white soapy clay, more or 

 less laminated ... 



Shaly or rotten coal ... 



Greyish white clay, with plant remains 

 Coal with dull and lustrous bands 



Feet. 



In. 



6 











3 



6 







1 







2 



11 



3 



10 



Fine-grained greyish sandstone 



MIDDLE SHAFT (MASON'S). 



Shaft. 



Common yellow clay 



Brown coaly shale 



Yellowish or white soapy clay, more or 



less laminated ... 

 Hard bluish shale, with Zeugophyllites 



elongatus in great abundance 



Lustrous coal 



Hard bluish slate, with Zeugophyllites, 



etc. 



Lustrous coal 



Blue shale 



Bore. 

 Coarse grey sandstone, in which bore 



was sunk to a depth of 



SOUTH BOKB HOLE (MASON's). 



Yellowish clay ... ..<, 



Iron gravel 



Yellow clay 



Coarse grey sandstone 



Blue, hard shale, with plant impres- 

 sions 



20 



Feet. 



In. 



6 











4 



6 







4 











3 



2 







— 



4 



1 



6 



11 



9 



32 



2 



Feet. 



In 



. 4 







. 1 







3 







. 10 







